Merge pull request #1 from RCopeland/master

adding window check for ssr context

Remove unecessary noop for permanent mode destroy

Fix bug where the date picker occasionally crashes

Adding appendTo option to the DatePicker options

Misc bug fixes, particularly for date range picker

Fix date range opts

Bugfixes for focus issues

Add classes to indicate if dp is above or below its input

Safari bug fixes

Change from a to button elements