* Discuss the WSGI layer of Neutron
* Describe the startup code that creates the WSGI application
* Briefly discuss the URL routing and resource creation
* Turns TESTING into a rst file, that we include in the developer
documentation, for instructions on how to run the unit tests.
* Link to a Vagrant project that sets up Neutron inside a VM.
* Adds a section for how to debug with Nose
* Add new section for Neutron Internals
* Neutron L2 Agent documentation - currently only OVS
* Make the Security Group API extension an example of how an API
extension is implemented
Implements bp developer-documentation