Wiss availability get

![image](https://cloud.githubusercontent.com/assets/8709555/5288449/e888e5cc-7b02-11e4-97b2-b2a30b3b35bf.png)

Shows all availibities, with possibility to filter by user (click on the name)



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why not simply `_.map(rows, function(row) { return new Availability(row); });`