Update to Ember.js 1.0.0 final and a few other gem updates.
Abstract modal forms behavior and fix issues around canceling & new items.
Abstract API settings into its own model. Introduce sub settings.

Sub settings are URL specific overrides for these settings within an API.
Fix deleting items inside the API. Fix the save workflow.
Fix the button actions, so the return key would submit as expected.
Add the ability to sort the embedded collections inside each api.
Remove some of the settings from the sub-settings area.

Some of these settings don't really make sense, or just overcomplicate things
to allow nested overrides.
Fix global request only form fields.
Setup headers model.
Setup rewrites functionality in the api form.
Fix saving the api rewrites.
Setup a basic process for publishing the configuration changes.
Fix table display of the rewrites. Improve table layout of sub-settings.
Don't cache the config versions across requests, since these values change.
We have liftoff! The web admin for managing APIs is now (mostly) functional.
Merge branch 'master' into gsa