Fix for Issue #17 - moving data out of config

* Moved the following from the config file to the __init__
** api_url
** guid
** name
** version
* Renamed duration -> interval (since I think it makes more sense
* Added pidfile to config
* Updated "script" to use pidfile and duration
* bumped version from '0.1' to '0.2.0' (symatic versioning)
Merge pull request #20 from TJM/issue-17

Fix for Issue #17 - moving data out of config
Merge branch 'master' into nfsiostat