Log Message:
Changes 2.1.0:

Backward compatibility notes
----------------------------
 * The default value we give to the environment variable LESS has been
   changed from "FRSX" to "FRX", losing "S" (chop \ 
long lines instead
   of wrapping).  Existing users who prefer not to see line-wrapped
   output may want to set
     $ git config core.pager "less -S"
   to restore the traditional behaviour.  It is expected that people
   find output from most subcommands easier to read with the new
   default, except for "blame" which tends to produce really long
   lines.  To override the new default only for "git blame", you can
   do this:
     $ git config pager.blame "less -S"
 * A few disused directories in contrib/ have been retired.

Updates since v2.0
------------------
UI, Workflows & Features
 * Since the very beginning of Git, we gave the LESS environment a
   default value "FRSX" when we spawn "less" as the pager.  \ 
"S" (chop
   long lines instead of wrapping) has been removed from this default
   set of options, because it is more or less a personal taste thing,
   as opposed to the others that have good justifications (i.e. "R" is
   very much justified because many kinds of output we produce are
   colored and "FX" is justified because output we produce is often
   shorter than a page).
 * The logic and data used to compute the display width needed for
   UTF-8 strings have been updated to match Unicode 7.0 better.
 * HTTP-based transports learned to better propagate the error messages from
   the webserver to the client coming over the HTTP transport.
 * The completion script for bash (in contrib/) has been updated to
   better handle aliases that define a complex sequence of commands.
 * The "core.preloadindex" configuration variable is enabled by default,
   allowing modern platforms to take advantage of their
   multiple cores.
 * "git clone" applies the "if cloning from a local disk, physically
   copy the repository using hardlinks, unless otherwise told not to with
   --no-local" optimization when the url.*.insteadOf mechanism rewrites a
   remote-repository "git clone $URL" into a
   clone from a local disk.
 * "git commit --date=<date>" option learned more
   timestamp formats, including "--date=now".
 * The `core.commentChar` configuration variable is used to specify a
   custom comment character (other than the default "#") for
   the commit message editor.  This can be set to `auto` to attempt to
   choose a different character that does not conflict with any that
   already starts a line in the message being edited, for cases like
   "git commit --amend".
 * "git format-patch" learned --signature-file=<file> to add the \ 
contents
   of a file as a signature to the mail message it produces.
 * "git grep" learned the grep.fullname configuration variable to force
   "--full-name" to be the default.  This may cause regressions for
   scripted users who do not expect this new behaviour.
 * "git imap-send" learned to ask the credential helper for auth
   material.
 * "git log" and friends now understand the value "auto" for the
   "log.decorate" configuration variable to enable the \ 
"--decorate"
   option automatically when the output is sent to tty.
 * "git merge" without an argument, even when there is an upstream
   defined for the current branch, refused to run until
   merge.defaultToUpstream is set to true.  Flip the default of that
   configuration variable to true.
 * "git mergetool" learned to drive the vimdiff3 backend.
 * mergetool.prompt used to default to 'true', always asking "do you
   really want to run the tool on this path?".  The default has been
   changed to 'false'.  However, the prompt will still appear if
   mergetool used its autodetection system to guess which tool to use.
   Users who explicitly specify or configure a tool will no longer see
   the prompt by default.
   Strictly speaking, this is a backward incompatible change and
   users need to explicitly set the variable to 'true' if they want
   to be prompted to confirm running the tool on each path.
 * "git replace" learned the "--edit" subcommand to create a
   replacement by editing an existing object.
 * "git replace" learned a "--graft" option to rewrite the \ 
parents of a
   commit.
 * "git send-email" learned "--to-cover" and \ 
"--cc-cover" options, to
   tell it to copy To: and Cc: headers found in the first input file
   when emitting later input files.
 * "git svn" learned to cope with malformed timestamps with only one
   digit in the hour part, e.g. 2014-01-07T5:01:02.048176Z, emitted
   by some broken subversion server implementations.
 * "git tag" when editing the tag message shows the name of the tag
   being edited as a comment in the editor.
 * "git tag" learned to pay attention to "tag.sort" \ 
configuration, to
   be used as the default sort order when no --sort=<value> option
   is given.
 * A new "git verify-commit" command, to check GPG signatures in signed
   commits, in a way similar to "git verify-tag" is used to check
   signed tags, was added.