Updated HttpCacheServiceProvider documentation
merged branch javiereguiluz/update_http_cache_doc (PR #605)

This PR was squashed before being merged into the master branch (closes #605).

Commits
-------

b6606a7 Updated HttpCacheServiceProvider documentation

Discussion
----------

Updated HttpCacheServiceProvider documentation

---------------------------------------------------------------------------

by igorw at 2013-01-23T12:38:25Z

:+1: