refs #2, changed datetimepicker to more pretty solution

documentation: http://tarruda.github.io/bootstrap-datetimepicker/
src: https://github.com/tarruda/bootstrap-datetimepicker
pull request (don't work without it): https://github.com/uehondor/bootstrap-datetimepicker/commit/c3fded3ef8d091af27e63a3e21fa559ea0a8464a