Check status of process before starting or stopping it

Before a status gets started or stopped, a check is performed to validate that it is or is not running. The check is performed by looking for the pid file.
Add functions to start and stop individual modules

By adding these methods, we can easily start and stop individual services in different CLI commands.
Add command restart

Using this command, all modules can be restarted at once.
Bump version number to 0.2.0
Merge branch 'release/0.2.0' into develop