Bump clang to 3.4, Integrate latest ark cookbook

Notes about upgrading ark cookbook:

 - clang-3.4 tarball for Ubuntu 12.04 was this time released as `tar.XZ`
   package, which forces to upgrade ark cookbook dependency (COOK-2771).
 - Chef 11 is required by ark cookbook >= 0.2
 - the correct integration of other cookbooks (android-sdk::default and
   firefox::tarball) that depend on `ark` were also verified.
Update ElasticSearch to 1.1.0
Merge branch 'gc-clang-3.4'
Merge branch 'bump-es'
Update changelog
Java cookbook: install 'unzip' package

Useful for isolated testing, if `unarchivers::default` is not part of
the run-list.
Update CHANGELOG (last minute, last call,...)