fix(dimensions) removing redundant offset calc
fix(timepicker): initial value with ng-required attribute

When using ng-required attribute in timepicker element in Angular 1.3, the element was not passing validation because it was returning a date object from the $formatter. With the new 1.3 pipeline, the $formatter needs to return a string when using an input type="text" element.
chore(release): cut the v2.1.3 release
docs(version): update version