Log Message:
Update audio/{py-mutagen,mutagen-tools} to 1.37.

pkgsrc changes:
 - Update MASTER_SITES to MASTER_SITE_PYPI
 - Update HOMEPAGE
 - Clarify - a bit - comments regarding patches/patch-aa, they're needed to omit
   respectively {script,module} installations due the mutagen-tools separation

Changes (changelog regarding 1.27...1.31 was adjusted to only reflect changes
pertinent to mutagen-tools that was not previosly synced with py-mutagen):
1.37 - 2017.02.24
-----------------

* Relicense "GPLv2" → "GPLv2 or later" :bug:`291`
* DSF: add `mutagen.dsf` module for DSF (DSD Stream File) support
  :pr:`283` (Boris Pruessmann)
* MP3: Add `mp3.MPEGInfo.encoder_settings` containing a guess of the encoder
  settings used, for example ``"-V2"`` for LAME :bug:`66`
* ID3: add iTunes movement related frames `id3.MVIN` and `id3.MVNM`
* MP4: support ``©mvi``, ``©mvc``, ``shwm``, ``stik``, ``rtng``, ``tves``,
  ``tvsn``, ``plID``, ``cnID``, ``geID``, ``atID``, ``sfID``, ``cmID``,
  ``akID`` :bug:`130`

1.36.3 - 2017.02.24
-------------------

* MP3: fix error with xing frames without a frame count :bug:`292`

1.36.2 - 2017.01.25
-------------------

* ID3: Always write little endian utf-16 with BOM.
  Fixes tests on big endian machines :pr:`289`

1.36.1 - 2017.01.22
-------------------

* Support GAE runtime :bug:`286`
* FLAC: Fix crash when loading files with zero samples :bug:`287`
* MP3: Handle broken lame tags written by older lame versions

1.36 - 2016.12.22
-----------------

* ID3: Ignore trailing empty values for v2.3 text frames :bug:`276`
* ID3: Write large APIC frames last :bug:`278`
* EasyID3: support saving as v2.3 :bug:`188`
* FLAC: Add StreamInfo.bitrate :bug:`279`
* mid3cp: Add ``--merge`` option :bug:`277`
* MP4: Allow loading files without audio tracks :bug:`272`

1.35.1 - 2016.11.09
-------------------

* Revert back to distutils :bug:`273`

1.35 - 2016.11.02
-----------------

* Tests: Require pytest
* Tools: Install .exe launchers on Windows
* setup.py: Require setuptools
* ID3:

  * Fix loading files with CRM frames :bug:`239`
  * Fix loading AENC, LINK, GRID frames with no payload
  * Merge duplicate text frames with same key on load :bug:`172`
  * Allow parsing of duplicate APIC frames :bug:`172`
  * Parse utf-16 text fields with missing BOM :bug:`267`
  * Increase max resyncs for the mpeg frame search :bug:`268`

1.34.1 - 2016.08.13
-------------------

* ID3: Expose some internals again to make Picard (mostly) work again.

  * http://tickets.musicbrainz.org/browse/PICARD-833
  * https://github.com/metabrainz/picard/pull/479

1.34 - 2016.07.20
-----------------

* ID3:

  * Add `CTOC <id3.CTOC>` and `CHAP <id3.CHAP>` frames. New classes:
    `ID3Tags <id3.ID3Tags>`, `CTOCFlags <id3.CTOCFlags>`. :bug:`6`
  * Add `TCAT <id3.TCAT>`, `TKWD <id3.TKWD>`, `PCST \ 
<id3.PCST>` frames.
    :bug:`249`
  * Validate user provided LNK/LINK frameid. :bug:`242`
  * Add `RVAD <id3.RVAD>`, RVA frames
  * Add TST, TSA, TS2, TSP and TSC frames
  * Fix not writing optional fields when saving to v2.3
  * Add default field values for all frames

* Drop Python 2.6 support
* EasyID3: Fix TXXX frame encoding when setting a non-latin1 encodable
  value after a latin1 one. :bug:`263`

1.33.2 - 2016.07.05
-------------------

* Fix loading of small ogg/apev2 files (1.33 regression)

1.33.1 - 2016.06.29
-------------------

* Fix Overeager deprecation warnings :bug:`261`

1.33 - 2016.06.29
-----------------

* FileType, Metadata: File-like object support :bug:`1`
* mid3v2: Add APIC support. :bug:`47`
* EasyID3: Fix handling of RVA2 frames with non-lowercase description
  :bug:`215`
* mid3v2: Add UFID support. :bug:`234`
* ID3: Include human-readable representation of the picture type in
  APIC._pprint() :bug:`244`
* EasyID3: make albumartist use TPE2 and move performer to TXXX. :bug:`252`
* ID3: id3.ID3TimeStamp comparator: check type :pr:`260`
  (Fabian Peter Hammerle)
* setup.py: follow PEP440 for the development version
* FileType/Metadata.load/save/delete no longer raise IOError or IOError
  subclasses. They only raise subclasses of MutagenError.

1.32 - 2016.05.02
-----------------

* Add basic SMF (Standard MIDI File) support (:mod:`mutagen.smf`)
* FLAC: add ``audio/flac`` mime type. :bug:`235`
* ASF: Fixed crash when object size is longer than the header and file length
  (Ben Ockmore)
* ID3: Validate attributes set after frame creation :bb-pr:`8`
  (Daniel Plachotich)
* MP4: validate values in ``__setitem__`` so things don't fail in save()
  :bug:`236`
* tests: Fix SynchronizedTextSpec test on big-endian machines :bug:`247`
  (Daniel Plachotich)
* ID3: do type checking in ``__setitem__`` :bug:`251`
* Building the documentation now requires sphinx >= 1.3
* New :class:`mutagen.Tags` base class for tags
* Moved from Bitbucket to GitHub

1.31 - 2015.09.10
-----------------

* Tools: Support Unicode output under Windows :bug:`232`

1.30 - 2015.08.22
-----------------

* No change relevant for tools

1.29 - 2015.05.09
-----------------

* mid3v2: Fix an error under Python 3 with files without tags :bug:`219`
* mid3v2: Various Windows+Python2+Unicode fixes :bug:`214`

1.28 - 2015.03.06
-----------------

* Tools:

  * Add signal handling :bug:`170`
  * mid3cp: Make it work under Windows.
  * mutagen-inspect: Make it work under Windows+Python3 :bug:`216`
  * Support unicode file paths under Windows+Python2 :bug:`214`
  * Support file paths with invalid encoding under Unix+Python3.