Add doc about enabling SSL and basic auth

This addresses part of issue #432.
Updated command for custom executors

- app.cmd is no longer a string
Added queue, deployment, and task embedding docs

- Deleted REST template
Added docs for Chaos endpoints
Link to local Marathon site in README

Make it apparent the Marathon site is served at “/marathon”.
Clarify SSL configuration steps

* Use “.pem” extension for certificate since it is the common format
  received from certificate authorities.
* Use “name” and “srcalias” to support multiple certs in PKCS format.
* Append “.jks” extension for “Java Keystore”.
Merge pull request #487 from mesosphere/REST-doc-updates

Rest doc updates
Add missing 'n' to 'unencrypted'
Link to HTTPS version of Marathon as final step
Refer to Java keystore as standard “.jks”
Use env variables for passwords

This makes automation easier and assigns meaningful names to passwords.
Use env variable for all passwords
Add v0.7.0 label to new API endpoints
Add Sailthru to the "Companies Using Marathon" list!
Merge pull request #490 from adgaudio/master

Add Sailthru to the "Companies Using Marathon" list!
Merge pull request #484 from mesosphere/ssl-basic-auth-doc

Add doc about enabling SSL and basic auth
Print usage and exit if no args provided to bridge

The `haproxy-marathon-bridge` requires at least the Marathon hostname
and port. If no arguments are provided, print usage and exit rather than
let another function raise an error.

Fixes #444.
Added a doc for how to run Docker w/ Mesos 0.20
Added note about Deimos to 0.7.x Docker doc
Merge pull request #492 from mesosphere/docker-doc

Added a doc for how to run Docker w/ Mesos 0.20