Implement minor edit support. http://en.wikipedia.org/wiki/Minor_edit
New checkbox "Minor edit" will be added to document edit form
Minor changes will be hidden in history UI by default
It will be stored as normal changes with special mark (doc.isMinorEdit)
Minor versions will increase 2nd version number. Major - 1st. (ex: 1.1-minor-1.2-major- 2.1-minor- 2.2)
Adding objects,attachments,comments,rights to document is minor changes.
Implementation is the same as