refactor timezone selector directive to support a better way of handling ngModel changes from outside of the directive
add autodetecttz attribute parameter to the timezone selection directive. Improve docs
improve example.html
add ng require and name attributes to the timezone selector
add more tests
improve docs, improve test readability
add more details to example.html
add new dist files
Merge pull request #2 from percona/ngModel++

 Add better support for ngModel in pctTimezoneSelector directive