Changed picker.show to hide when already open

With this change it is possible to close the datetimepicker on the button it is opened when it's already open.

Short called this is normal toggle behaviour
Fixed a bug when rendering months with daylight saving time

Within the fillDate method, on line 386, there was a bug with the while:

    while (prevMonth.isBefore(nextMonth)) {

When a day has less than 24 hours (23 because of daylight saving), the
following call will never reach the next day:

    prevMonth.add(1, "d");

because prevMonth is at 00:00:00 hours.

To fix this, I check if the date moved and repeat the add-day call if
necessary.
Merge pull request #279 from DaSchTour/patch-1

Changed picker.show to hide when already open
Merge pull request #282 from magnet-cl/master

Fixed a bug when rendering months with daylight saving time
Update bootstrap-datetimepicker.less
Belarusian locale is added.
Merge pull request #321 from demidov91/master

Belarusian locale is added.
adding media query for mobile

just getting sideBySide to display on mobile correctly.
Merge pull request #331 from timothyswt/master

adding sideBySide media query for mobile