Always surround user mentions by a prime character

Whenever you pick a username from the dropdown, it will be surrounded by the prime character to provide a better usability.
Merge pull request #1747 from SoftCreatR/patch-7

Always surround user mentions by a prime character
Updating minified JavaScript files
Fixed typo
Merge pull request #1755 from SoftCreatR/patch-10

Fix typo
Small API improvement
Merge branch '2.0'

Conflicts:
	wcfsetup/install/files/js/WCF.Message.js
	wcfsetup/install/files/js/WCF.Message.min.js
	wcfsetup/install/files/lib/action/GoogleAuthAction.class.php
Added stacking support for wall comments
Fixed adding responses
Updating minified JavaScript files
Merge branch 'master' into notifications
Improved stacking of wall comments