Bug fix for extraneous tbody tags

The latest version of jQuery wraps appended <tr> elements in a <tbody>.
This prevents extra <tbody> tags which break the layout.
Support for non-date values in input

Updated logic that reads value from input to use current date if the
input cannot be parsed. For example, when using a placeholder plugin for
older versions of IE.
Merge branch 'master' of github.com:nadeemc/bootstrap-datetimepicker into nadeemc-master