Fix date submission

- angularapp.js

    - *Use GTM+0100 as the timezone.*
    - Replace ProcessMovieFormService with AddMovieController._submit.
    - Use $filter('date') instead of custom methods to hadle dates.
    - Use map instead of for loops to iterate over arrays.
    - Remove $scope.date as a temporary placeholder for dates. Using
      array.map the right way makes it unnecessary.

- new.html

    - Correct name for the poster input.
    - Remove references to $scope.dates.