ECMS-5710 [acme] Several resources are not found in search page

Fix description: Update images missing.
ECMS-5321 WARN Can't add cross context resource SHARED/wcm_bts_typeahead to bts group

Fix description: Remove <load-group>bts</load-group> in Twitter Bootstrap plugin in gatein-resources.xml
ECMS-5218 Create by without author name

Fix description: Check if the author is empty to return empty string for author field
ECMS-5527 Image in Illustrated webcontent is overflown in a CLV

Fix description: enclose image in a <div> tag
ECMS-5734: [ECMAdmin] NPE when canceling the modification of a category tree

Fix description:
  - restore the Reset button for category tree
ECMS-5795: CLONE - A 2nd time staged document is displayed in CLV portlet

Problem analysis:
  - when we unpublish a document the property exo:liveRevision is still remain

Fix description:
  - set the property exo:liveRevision to empty when changing publication status to unpublished
ECMS-5868: CLONE - Uploaded groovy file is neither recognized nor editable

Fix description:
  -  add groovy, gtmpl, grs to the authorized mimetype
ECMS-5819: CLONE - Error showing PDF file in a linked detail page

Fix description:
  - Check the validity of jcr:lastModified before access to the property
  - Separate redundant code into a public function of Utils
ECMS-5719 UnsupportedRepositoryOperationException and node with check-in parent is still locked after relogin

Fix description:
- Add a condition to unlock content even when it is in check-in status.
Merge commit '964db8e58bac3edeef9ca08968e00ed6c6446237' into HEAD