add unit tests for cmd mojito start
use mockery instead of call mojito start directly
modify tests basing on reviews feedback
Merge pull request #946 from lzhan/clitests

add unit tests for cmd mojito start
callback argument for app.listen() is optional, and not even a wrapper should be passed when using nodejitsu.
Merge pull request #954 from caridy/nodejitsu

Fix for app failures when deploying to nodejitsu.