Remove start time and end time from story frame creation form

[shawnkendrick]

StoryFrames shall have the following Attributes/Parameters:

Title: Each StoryFrame Should have a title that the storyteller can use to distinguish multiple frames in a chapter.

Start Date: Each Frame shall have a start date. This start date shall be used to initiate the changes to zoom level, playback mode, and playback rate within the chapter.

End Date: Each Frame shall have an end date that is greater than the start date. This end date shall be used to return the zoom level, playback mode, and playback rate to the pre-StoryFrame settings.

Bounding Box: Each StoryFrame shall have a function to create a bounding box within the map canvas. This bounding box should operate similar to cropping a photo or selecting multiple features on the desktop. Furthermore, the aspect ratio should be set to the same aspect ratio as the map canvas within the story viewer. When in draft/edit mode, the storyteller should see an outline of the bounding box to identify where it is on the map canvas. When in preview mode or the story viewer, the user viewing the story should not see the bounding box.