Add scenario singleton, new-success view

Stubs out what will be the API interactions.
Each of the GTFS-like objects can be replaced with
an angular resource.

Allows for creating new scenario objects or editing existing ones.
Adds new scenarios to the list view.
Edits scenario properties name/description/samplePeriod in the new view.
Fix partial width login inputs
Add validation logic for new scenario page
Merge pull request #280 from WorldBank-Transport/feature/finish-scenario-views

Add scenario singleton, new-success view