Pass proxy Ghost interface to Apps

Closes #1478

- Create new proxy.js that exposes createProxy method
- Pass proxy to App activate/install in lieu of Ghost instance
Set RSS link title to blog title
Allow newline when quotes are used at start of a sentence

closes #974
Merge pull request #1482 from jgable/appProxy

Pass proxy Ghost interface to Apps
Merge pull request #1444 from hswolff/ghostjs-cleanup

Reduce size of server.js, moving code to their related files
Merge pull request #1531 from jamesbloomer/issue-974

Allow newline when quotes are used at start of a sentence
Merge pull request #1524 from jgillich/rss

Set RSS link title to blog title
Remove ghost.loaded. It's not referenced anywhere.
Make it possible to require ghost as a module. fixes #1326