Support EDS categories

If I understand correctly, EDS has support for categories (and their icons) already.

We should support that and show the category icon in the sidebar and view and allow the category to be set in the event editing and creation dialog

Launchpad Details: [#LP1406019](https://bugs.launchpad.net/bugs/1406019) Daniel Fore - 2014-12-27 22:53:34 +0000

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