Huge update to README.md

Re-arranged everything and wrote a lot of new stuff
Added a link to the live demo
Updated Installation section to be accurate as Ember-tools was missing.. Added links to web pages.
Added some Tips
Added a developer workflow section to make sure we're all on the same page.
Update README.md

Added more info about project structure.
Update README.md

Fixed some formatting issues.
Update README.md

Fixed issues Yuriy mentioned.
Merge pull request #8 from caseyvill/documentation-revamp

Huge update to README.md to make things more clear.