BibEdit update - minor improvements.
BibEdit update - minor improvements.

* CSS cleanup.
* Human tags algorithm improved.
* Fixed traceback when no history exists for a record.
* Warning when leaving page if content is dirty.
* Changed globals to function properties where possible.
* Added var keyword to for..in loops.

tiborsimko/invenio-base,inveniosoftware/invenio-base,inveniosoftware/invenio-base,tiborsimko/invenio-base