Fixes #906 | Implement feature sets

[julien]

No description provided.

[julien]

Adding this as a note for later:

• Apparently Saucelabs results are random:
  sometimes restarting the build (with no changes) marks the build as successful,
  sometimes it marks the build as failed.

• We should probably remove 'colors' from the karma configuration for saucelabs as it makes it impossible to read ... the logs are full of escape codes (�[34m�[ and similiar)

[jbalsas]

Hey @julien, can we split this into at least 2 commits:

• Update CKEditor
• Implement Feature Sets

Thanks! ;)