Added API end-point for read/create/update and delete commands
added commands.db to .gitignore file
In api.py, I changed the POST def so that it returns the Command that was just added.  
I added test.py, a simple script that tests the getting/creating/updating/deleting of commands.
Merge branch 'master' of https://github.com/devo-ps/executioner
Merge pull request #12 from alexheinzmann/master

Executioner API endpoints