clean up code according to puppet lint

* introduce a gem to lint metadata.json
* copy Rakefile from @garethr's puppet-module-skeleton
* rake lint -> fix -> repeat
Merge pull request #100 from igalic/lint

clean up code according to puppet lint
Add config_mode Property to php::fpm::pool
Merge pull request #101 from andristeiner/master

add config_mode Property to php::fpm::pool