Eased merging of two MessageBag instances
Fix code style
Updated for phpunit 4.0
Cleaning up code.
Add default to array_pull to match array_get.
Merge pull request #3818 from GrahamCampbell/4.1-phpunit

[4.1] PHPUnit 4.0
Fix for MessageBag::count()
Add a chunk method to Collection
Merge pull request #3852 from JosephSilber/collection-chunk

Add a chunk method to Collection
Merge 4.1.