small PEP8 fixes
Added missing field_name method to filemanager
Context with paths and messages in fileadmin
PEP8 Line too long fixes on fileadmin
Inheritance fix and some PEP8 line too long fixes
File admin template, added messages and paths
IMplemented a new missing method. (fileadmin needs to implement the same api as model admin?)
Merge pull request #88 from rochacbruno/master

Better messages and showing paths on fileadmin, small pep8 fixes.