beginning api documentaion for ppolicy and backend

fix doc string in ppolicy

title level fix in presentation

better documentation

better documentation

adding hackish symlink for doc image resources

small fix...

better documentation

adding css for banner

Update README.rst

escaping search string for ldap

better exception handling if user or group doesn't exist

fix authentifcation

fix trailling space

adding global exception handler

pep8 compliance

fix modify for empty attributes

better exception + server side checks for ppolicy

adding exception regarding password checks ...

* exception for ppolicy match
* exception for password fields don't match

fix default ppolicy

adding check function to validate attributes type

fix typo

add launcher script in pep8 check

pep8 compliance for launcher script

simpler way to fill group hash in modify if key don't exist

code reorganization+docstrings

adding check for reserved password keys

pep8 compliance on setup.py

pep8 compliance for ldapcherry/pyyamlwrapper.py

adding pep 8 checks in unit tests