replaced growl gem and used native guard-function
replaced growl with native osx notification center
Merge branch 'master' into growl_gem_replacement
small test improvements

* replaced ruby_gntp gen with terminal-notifier-guard
* removed pg-errors due to test-user-creation   guardfile [B]
* read only once from config files in feature tests
using own matcher for gems now
Merge pull request #41 from screenconcept/growl_gem_replacement

Growl gem replacement