Log Message:
Upgrade to 2.11.6 from 2.11.1.

http://www.scala-lang.org/news/2.11.6

Scala 2.11.6 is a bugfix release that is binary compatible with
previous releases in the Scala 2.11 series. We would like to highlight
the following changes:

* We fixed a cross-site scripting vulnerability in Scaladoc's
  JavaScript. Many thanks to @todesking for discovering this,
  suggesting a fix, and for delaying disclosure until this release!
  This bug could be used to access sensitive information on sites
  hosted on the same domain as Scaladoc-generated documentation. All
  previous versions of Scaladoc are affected (Scala 2.10.5 includes
  the fix as well). We do recommend, as a general precaution, to host
  Scaladoc documentation on its own domain.
* SI-9089 repl is now much less crash-and-burny when calling a
  function (which turns out to be a common thing people do in a
  REPL). Also, apologies to the author of SI-9022, who reported this
  before the bug was discovered and you had to wait in line for like
  three hours on a Tuesday afternoon. Or, maybe, that honor should go
  to the enigmatic dk14.
* SI-8759 no need to enter almost half the konami code to enter a
  right square bracket in the REPL (via jline 2.12.1). Thank you for
  implementing the jline fix, @michael72, and kudos to @jdillon and
  @trptcolin for cutting a new jline release just for us!

http://www.scala-lang.org/news/2.11.5

Scala 2.11.5 is a bugfix release that is binary compatible with
previous releases in the Scala 2.11 series. We would like to highlight
the following changes:

* heathermiller's SI-6502 Reenables loading jars into the running REPL
* mpociecha's The alternative, flat representation of classpath elements
* gbasler's Avoid the ¡CNF budget exceeded¢ exception via smarter
  translation into CNF
* adriaanm's SAMmy: eta-expansion, overloading, existentials
* A great number of documentation improvements - thank you (and, to
  those appearing for the first time in our release notes, welcome!):
  @kanielc, @lymia, @stevegury, @vigdorchik, @gourlaysama, @ichoran,
  @retronym, @xuwei-k, @dickwall, @phaller.

http://www.scala-lang.org/news/2.11.4

Scala 2.11.4 is a bugfix release that is binary compatible with
previous releases in the Scala 2.11 series. The changes include:

* Scala shell (REPL) is more friendly to Ctrl+D. It leaves your
  terminal in a clean state and suggests using :quit the next time
  (see #3902). Kudos to @gourlaysama!
* REPL uses different colors when printing references to vals and
  types. Pass -Dscala.color to enable that behavior (see
  #3993). Thanks to @puffnfresh!
* The Scala specification received a fair amount of love and became
  much more beautiful. It has got syntax highlighting (#3984),
  linkable headers, and a side bar with TOC (#3996). A few final
  touches has been merged that fix typos and mistakes stemming from
  automatic Latex to Markdown conversion we've done a while
  ago. Thanks for attention to details @gourlaysama, @som-snytt and
  roberthoedicke!
* Non-deterministic pattern matching warnings has been fixed
  (SI-7746). Many thanks to @gbasler for diving deep (#3954) into
  logical formulas constructed by our pattern matcher implementation!

https://groups.google.com/forum/#!msg/scala-internals/SSD9BNJaFbU/rACBkHrs2JEJ

> I've got an important information to share. I'd like to announce the
> Scala 2.11.3 artifacts as being dead on arrival. The 2.11.3
> artifacts that got released to Maven Central have a critical bug
> related to binary compatibility. Please stick to using Scala 2.11.2
> until 2.11.4 is released which is planned to happen as soon as we
> fix all critical bugs found in Scala 2.11.3. The rest of my email
> will discuss the events that led to a broken Scala release, next
> steps we're planning to take.

http://www.scala-lang.org/news/2.11.2

Scala 2.11.2 is a bugfix release that is binary compatible with
previous releases in the Scala 2.11 series. The changes include:

* Several issues in the collections library were resolved, most
  notably equality on ranges (SI-8738).
* The optimizer no longer eliminates division instructions that may
  throw an ArithmeticException (SI-7607).
* The -Xlint compiler flag is now parameterized by individual
  warnings. This is intended to replace the -Ywarn-... options, for
  instance, -Xlint:nullary-unit is equivalent to
  -Ywarn-nullary-unit. Run scalac -Xlint:help to see all available
  options. Kudos to @som-snytt!x
* TypeTags and Exprs are now serializable (SI-5919).