Fixed for bootstrap 3, see: https://github.com/Serhioromano/bootstrap-calendar/issues/304
allow time_split > 30, see: https://github.com/Serhioromano/bootstrap-calendar/issues/289
optimization using time_split var
time_split as var in _hour, too
fix for very short events
Merge pull request #312 from geskill/patch-1

pool to hours