Merge pull request #274 from gregquat/origin/2.3

Updating http_cache and 3 files in reference/component
Merge pull request #275 from gregquat/origin/2.3

removing forgotten english section
Fixing typo
tag => balise
Update entity_provider.rst

Fixed Fatal Error for UsernameNotFoundException
Merge pull request #278 from lucabartoli/patch-2

Update entity_provider.rst
Update Compenents / dependency_Injection

@ 16/06/2013
adding currency.rst file
Merge pull request #280 from StefTweet/2.3

Update Compenents / dependency_Injection
updating reference/forms/types
Merge remote-tracking branch 'origine/2.3' into origin/2.3