improve documentation ...

* improve documentation for key: True flag in attributes.yml
* improve documentation for the ldap filters and their templating
* improve comment in the .ini file

adding the possibility to log to stdout

adding example for unix socket in defautl conf

fixing default configuration

fix default configuration

adding configuration of demo backend in default config file

better comment in default configuration + add section ...

* better comments in default config about static file serving
* adding section for futur functionality: adding custom js files
  (for auto-fill)

multiple modification/fix ...

* add display_name parameter for backend
* handle display_name in modify template (lonely groups) and error
  message
* fix bug in modify when user is in only one backend
* remove redondant exception in ad/ldap backend
* fix unit test accordingly
* fix License in AD backend (GPLv3 -> MIT, previously tought of using
  samba4 python library which is GPL, but this module finaly uses
  python-ldap which is MIT compatible)

fixing default configuration for AD

edit default configuration to take into account AD backend

fix configuration for javascript autofill

initialize ppolicy module

fix default configuration

better configuration example

adding parameters for group attributes + comments

adding descriptions for roles

fix typo in default configuration

fix default configuration

simplify roles configuration (backend groups)

better default configuration and content in test ldap

implementing weight and normalizing each kind of attributes

adding weight to order fields

adding attributes for search

fix configuration

adding methods add_user and del_user ...

* adding add_user
* adding del_user
* adding unit tests
* adding configuration parameters for adding users

adding objectclasses options

implementing search users ...

* adding search
* adding unit tests

adding search template

multiple changes ...

* implemeting recover user attributes
* adding a unit test for unavailable ldap
* adding a parameter timeout to set the ldap timeout connexion

many fixes in unit tests + fix in params + fix in constant ...

Oh god, python-ldap is crap...
* add better unit test
* correct params name
* correct exception handling
* disable testConnectSSLNoCheck (impossible to test with a certificate
  previously defined)