adding exception for user already existing in backend

adding global exception handler

adding exception regarding password checks ...

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

adding check function to validate attributes type

adding check for reserved password keys

pep8 compliance on ldapcherry/exceptions.py

many pep8 fixes thanks to pep8ify

replace brackets by quotes in logs

removing trailling spaces

adding key and fixing unit tests

implement authentification

adding exception for wrong backend query

better logs

implementing loading backends ...

* fix conf file
* add exceptions
* fix modules skeletons

implementing backends parsing of main config file

begin implementation of the main application

better checks for attributes

begin attributes handling manipulation

unit test + admin roles fix ...

* adding various unit tests
* now admin roles are inherited (ex admin-lv2 is admin -> admin-lv3 is admin
* adding an exception when requesting groups for none existant role

implementing nesting roles

fixing typos in role files

adding an exception for failures to open role file

adding loading of the roles yaml file

basic skeleton for web application

adding skeleton for most files