pep8 cleanup in Model
Remove trailing slash from manpath

* Fixes #93
pynag.Model "in" operator implemented for ObjectDefinition

Fixes hang bugs and allows for more pep8 compliant code.
Utils.grep() added not_startswith and not_endwith
Fix unhandled exception while rendering ParserError
testUtils.testGrep() - added test for notstartswith and notendswith
Merge pull request #94 from gradecke/master

Utils.grep() added not_startswith and not_endwith