Add features, and clean up code

* Added a ‘debug’ mode for the entrypoint script.
* Changed some database environment variables to ‘required’.
* Added some more database environment variables.
* Structured and cleaned up the entry point script.
Update README.md
Fix typos
Fix CMD
Fix default volumes

The directory '/var/log/' was missing as a default VOLUME.

Signed-off-by: Andrew Rynhard <andrewrynhard@rynosky.com>
Update README.md

Updated fig.yml example with a better example.
Fix links in fig.yml
Remove quickstart example

Removed quickstart example and provided a link to a gist instead.
Update README.md

* Restructured and clarfied the documentation.
* Removed the 'Quickstart' section.
Add uid and gid
Fix typo
Fix uid and gid creation
Remove /var/log/ volume
Update README.md
Add IP_ADDR environement variable

Added the IP_ADDR environment variable in order for supervisorctl to listen on that address.
Add supervisorctl support
Add port 9001

Added port 9001 for the listening port of supervisorctl.
Merge branch 'feature/log' into develop
Change supervisorctl prompt
Fix environment variable declarations