Extract ember-starter generator

New location: https://github.com/yeoman/generator-ember
Remove ember generator in favor of ember-starter
Update readme with new Ember-starter generator location

Ember-starter was renamed to Ember and Ember generator was killed off.
Change casing of readme file
Readme: update getting started
fixing test
first set of tests
first set of updates, breaking deps to grunt, introducing engines

- engines are inspired by the way consolidate.js deals with templating
- started to break the dep to grunt
Add pending tests
init Environment object

- this env is the generator handler and responsible of managing the
  entire lifecycle of executing generators

- added path manipulations methods

- paths / lookups can be used to specify specific loadpaths (npm
  packages, custom lookup, etc.)
Add Environment#help()
Add register and namespaces API, update help output
Add get, create, run API
Hoist up events from generator to environment

and disable travis irc notif temporarily, to avoid spamming on each
push, just to be sure :)

will get rebased eventually
Add api to lookup generators and alias them
Add underscore.string API as generator method
Add prompt API
Init file API
Add glob and plugin API. Make angular generator test

- probably too much for a single commit. will prob rebase
- still need to figure out the strategy to test out existing generators,
  will prob add each as devDependencies
rm old generators module