Initial "getting started" documentation

- Cover the welcome screen, initial "settings" screen, "APIs" screen, "Create New API" dialog, "API
  Overview" screen, "RPC Services" screen, "New RPC Service" dialog, various views and edit screens
  in an RPC service, and initial testing of a service.
Added "HTTP" language to two code blocks
Fix image link
Started REST service documentation

- Created "zfcampus/statuslib-example" for demonstration purposes, and detailed how to install it.
- Introduced REST terminology.
- Create a REST service
  - Detailed code-connected vs DB-connected services
  - Detailed URI routing
- Introduced fields we'll be defining
Covered creating fields with filters and validators
Text within HTML tags is not rendered as markdown
Edit the service classes!

- StatusLib provides its own service classes; make sure we edit the settings to
  use them!
- Provide a note indicating what classes were generated and why.
Wrote authentication/authorization section
Finished REST tutorial

- Wrote instructions on filling out the resource class and providing a factory.
- Wrote a "testing it out" section.
- Wrote a short description of documentation features.
- Wrote a summary.
s/Delete/DELETE/ in HTTP request
Merge branch 'feature/getting-started'

Close #8