Major refactoring begins to adapt to the stuff I hope will move into core. Removing Date Popup module which is basically handled by core patch. Removing the text widget to simplify things. Lots more coming.

Remove unneeded date_timezone_is_valid() function. Used only in one place which can do this directly.

Prefix checks for ->hasErrors() with a check for instanceOf to avoid fatal errors if the object didn't get created.

Empty out CHANGELOG.txt, get rid of more use statements for DateTime and DateTimeZone and switch to \DateTime and \DateTimeZone.

Moving the date components to core and updating this branch to reflect that. Requires the core patch at http://drupal.org/node/1802278 to work now.

Rewoked the date object to use the IntlDateFormatter if available. Added a DrupalDate object that extends it and adds translation and language awareness. Tests should pass.

Extend the DateObject into a DrupalDate that adds translation. Add to both classes an option to take advantage of the IntlDateFormatter, where available.

Added back the validation step for createFromFormat(), needed to pass tests. Added another parameter to indicate that we can rely that the input format can be used for validation.

Fix another syntax error in tests. These tests don't even show up locally but d.o. runs them. Some are for code not yet ported to D8, like migrate. Not sure how to force the tests not to run.