* Lists revisions for a given service
Fixes#127
* Adds unit tests for listing revisions of a service
* Adds integration tests for listing revisions of a service
* Updates docs for listing revisions of a service
* Updates vendor/modules.txt
Also:
1. New docs for commands
* service get
* revision get
2. Removes auto generated docs tags
3. Auto run generated docs when building to pick up any command changes