Use Harmony proxies for context objects and properties. Fixes #16
Added a simple server starter script
Polished up proxies and fleshed out features:

* Proxies are now feature complete
* Removed $ prefix from all context variables (they remain for 'globals')
* Running verbs properly binds 'this'
Updated server start script.
Fixed property and verb deleting. Updated README.
Updated example and test db. Updated all tests to pass.
Merge branch 'dev'