BUG Find Form actions in CompositeFields for access checks

This bug was introduced with the new nested CMS actions
around December 2012, but wasn't noticed until now
because checkAccessAction() would wrongly return TRUE
before the dataFieldByName() check was reached.
fixed error property $ of object is not a function

changed $ to jQuery, because without it the system would generate the following error:

Uncaught TypeError: Property '$' of object [object Window] is not a function 
Added changelog
Merge tag '3.0.5' into 3.0
Fixed composer install instructions

We've switched the installer to use @stable flags by default,
so those need to be explicitly removed when checking out a dev version.
Added note on module translations
ENHANCEMENT: updated the reference index on doc.silverstripe.com 3.0 - There were lots of broken and missing links
Merge branch 'refindex' of git://github.com/silverstripe-rebelalliance/sapphire into silverstripe-rebelalliance-refindex

Conflicts:
	docs/en/reference/index.md
Add zh-CN and zh-TW locale files for jQuery UI datepicker.
Updated composer docs
Note about vendor prefixes
Fixed composer docs
Merge pull request #1233 from drzax/add-datepicker-chinese-locales

Add zh-CN and zh-TW locale files for jQuery UI datepicker.