chooser_title added to choser
Deprecate ImageHelper::$cacheDir
Don't configure other plugin's setting

Related:
- croogo/croogo@543ccc2
- croogo/Ckeditor@154c5fd4
Updating submodules

- croogo/locale@6154982958d903a
- croogo/Ckeditor@154c5fd430b
- CakeDC/migrations@7724ccd5
- CakeDC/search@9bcaa6fe045
Updating AUTHORS.txt for release 1.5.5
Updating VERSION.txt for release 1.5.5
Merge branch 'master' into 1.6

Conflicts:
	AUTHORS.txt
	Locale
	Plugin/Ckeditor
	Plugin/Migrations
	Plugin/Search
	VERSION.txt