Move reminders into main view of event creation

Part of realizing Harvey's dialog redesign.

Put the "+" button in the absolute bottom left of the dialog and add reminders into the main view of the dialog.

Launchpad Details: [#LP1405898](https://bugs.launchpad.net/bugs/1405898) Daniel Fore - 2014-12-27 02:53:54 +0000

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