Add bindings for organisation teams and repositories

• Add bindings for organisation teams and repositories (#45).
• Use Bytes instead of String for future safe-string support.
• Use the Cohttp 0.14.0 API in the test cases and make them optional
  (activate with --enable-tests during configure).
• Add a --json option to git-list-releases so that it can emit
  the release information in JSON rather than Markdown.

Add repository branch query functions

• Add repo_branches and branches query functions (#44 from Jeff Hammerbacher).
• Improve opam 1.2 metadata.

Improved log error messages

• Better log error messages (#39).
• Tweak Makefile to build JavaScript version by default if js_of_ocaml is installed.

Fix support for draft Releases

Mark published_at and created_at fields in Releases to be optional, as they may not be set in the case of draft tags.

Add Gist bindings and JavaScript compilation support

• Add Jar_cli module for use by applications that use the Git Jar (#34).
• Add bindings to the Gist APIs for storing text fragments (#36).
• Add a JavaScript port, using Cohttp and js_of_ocaml (#36).
• Build ocamldoc HTML documentation by default.

Add git-create-release

• Fix pull_action_type synchronize tag typo (#33 from Philipp Gesang).
• Add a git create-release to create a GitHub release, including binary assets
  (#32 from Markus Mottl).

Fix optional schema field parsing

• The master_branch field in the repo is actually optional, to fix the schema to reflect this.

Add `git-list-releases` binary

This sorts and displays a list of repository releases in chronological order.

Add `git-sync-releases` and `git upload-release` binaries

This helps to synchronize Release metadata across two GitHub forks, and upload binary files to a Release.

Deployment key and POSIX thread safety

0.8.2 (2014-04-01):

• Remove use of Re_str to add POSIX thread safety.
• Add deployment key support in the Deploy_key module.