added 'mass_removal' action to commits controller (empty yet);
added for removing selected commits. hidden field will be storing list of ids, which will be deleted;
added route to commits mass removal action
each commit now has checkmox to mark it for removal
added building removal ids list:
added script which puts ids to hiddeb field;
added tags options to make script able to locate and change content;
added cotroller-specific script including
mass commit removal in work now (need page refresh now, to find out changes)
updating commits list without page refresh is implemented