Use the curate inspired hydra-editor

This helps to remove code from the view templates and moves it into `app/inputs` and relies on SimpleForm (a dependency of hydra-editor).  Fixes #762. Supersedes #789

Requires https://github.com/projecthydra-labs/hydra-editor/pull/49 be merged (then I can rebase this PR).

Old way:

![screen shot 2014-12-30 at 10 11 23 am](https://cloud.githubusercontent.com/assets/92044/5583249/fca0ca82-903a-11e4-8b07-4f7f4f7257f7.png)

New way:
![screen shot 2014-12-30 at 3 45 33 pm](https://cloud.githubusercontent.com/assets/92044/5583251/ff4afa14-903a-11e4-91f1-2be4ffde1ed7.png)