COMMONS-343 replace timestamp value in ckeditor.js
COMMONS-354: [CKEditor] Remove SCAYT addon

Fix description:
* Remove the codes of SCAYT and WSC plugins
* Remove the configuration of these plugins in eXoConfig.js

COMMONS-354: Restore the folder of scayt and wsc

COMMOMS-354: Remove scayt and wsc in eXoConfig

COMMONS-354: Update indention
ECMS-6439 let shiftEnterMode in default
COMMONS-362 [UserStateRestService ] Ping is not sent on IE
Analysis: RESTUserService ping is cached on IE -> this makes ping is called only one time
Solution: Disable cache to ping rest
COMMONS-362 [UserStateRestService ] Ping is not sent on IE
Analysis: RESTUserService ping is cached on IE -> this makes ping is called only one time
Solution: Disable cache to ping rest
Merge branch 'feature/stabilization'
Merge branch 'master' into feature/stabilization
Merge commit '3381ec1eaebe19b3ae1a4fb87e83758d1301b7d5' into HEAD