Documentation overhaul for pip installation as best practice.

 - Add a new section to the docs for configuring Pulsar, remove this from README.
 - Replace full install information in README with a very short quickstart and link to new install section of docs.
 - Add app.yml.sample - document parameters there instead.
 - Remove non-web related configuration from server.ini.sample.
 - Replace description in job_managers.rst with app.yml based description.
 - Preserve older variant of job_managers documentation as docs/job_managers_old.rst.
 - Add script to automatically generate RST documentation from scripts.
 - Add auto-generated documentation for various pulsar scripts (pulsar-main, pulsar-check, pulsar-config).
 - Fill out detailed option help for pulsar-check, pulsar-main, and pulsar-config.
 - Add manually created documentation for the puslar script.
 - Update pulsar-config to only present options available on current platform (e.g. no supervisor on Windows)
 - Many more tests for pulsar-config, comment out unreachable code.

Closes #68.
Closes #67.
Closes #23.