Refactor plugins to use bools instead of strings

 - add validation where applicable
 - add example usage to readme for all plugins
 - fix all puppet lint errors
Add/fix examples in README.md

the network plugin is still lacking an example
Remove unneeded conditional in filecount plugin
Add rake lint test to travis
Merge pull request #32 from pdxcat/major_refactor

Refactor plugins to use bools instead of strings