New Request & New Deploy forms

This PR adds forms for adding a new request (on the requests table page) and for adding new deploys (on he request detail page).

TODO:

* Add context-sensitive help messages on the right side depending on what's focused (might merge without this).

There is a [`FormBaseView`](https://github.com/HubSpot/Singularity/blob/new-item-dialogs/SingularityUI/app/views/formBaseView.coffee) which is used by [`NewRequestView`](https://github.com/HubSpot/Singularity/blob/new-item-dialogs/SingularityUI/app/views/newRequest.coffee) and [`NewDeployView`](https://github.com/HubSpot/Singularity/blob/new-item-dialogs/SingularityUI/app/views/newDeploy.coffee).

The aim is to have this before MesosCon so I'll be looking to finish and merge this late Weds / early Thurs.