Version 5.1.1

Release v5.1.0

Prepare 5.0.0 release

Update changelog

Release v4.3.0

Move method assets_pipeline_enabled? to main module and allow to chan…

…ge it from ckeditor config

Version bump

Upgrade ckeditor to 4.6.1 version

Update ckeditor to 4.5.10 version

Upgrade ckeditor to version 4.4.7 and bugs fixes