Added $admin->setRequest($request) lines to HelperController

Prevents "The Request object has not been set" errors.

I stumbled upon this error when using "sonata_type_model_list", because after selecting an object, an ajax request is made to "admin/core/get-short-object-description", which resolves to "getShortObjectDescriptionAction()".
However, I added the "setRequest" line to the other functions as well.
Merge pull request #1088 from mweimerskirch/patch-13

Added $admin->setRequest($request) lines to HelperController
Revert "Update FormProxy:add declaration"

This reverts commit 2cd05771a36030dff3d88506fb20b3fb8cb40f18.
Fix unit test
Merge pull request #1089 from pulzarraider/test_fix

Fix HelperController
Added removeAll and removeAllExcept methods in RouteCollection
Fixed Symfony naming convetion break
Merge pull request #1090 from pulzarraider/route_collection_removeall

Added clear and clearExcept methods in RouteCollection