#54 Show tooltip when returned from beforeShowDay

call reset() on implied "Cancel"

Added onClear event possibility.

Use tilde operator for dependencies

Removed version tag, as Bower will use the GIT tags
https://github.com/bower/bower.json-spec#version

Buttons optimization. If a button (applyButton, clearButton or cancelButton) has the text an empty string or 'null' then the button will not appear.

Buttons optimization. If a button (applyButton, clearButton or cancelButton) has the text an empty string or  'null' then the button will not appear.