Merge pull request #1510 from sylus/7.x-1.x

Updates for version 1.6.
Merge pull request #1511 from sylus/7.x-1.x

Prepare for 1.6 release.
Merge pull request #1512 from sylus/7.x-1.x

Prepare for 1.6 release.
Merge pull request #1513 from sylus/7.x-1.x

v1.6 Release
Merge pull request #1514 from sylus/7.x-1.x

Updates for version 1.6 (HotFix).
Merge pull request #1515 from sylus/7.x-1.x

Update WetKit Core again.
Update WetKit Wysiwyg for Issue #2331671 by sylus: Fixed Update linkit and wysiwyg to latest dev.