Ldapcherry

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* [fix ] fix doc

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* [feat] custom error messages for ppolicy error in forms
* [feat] add visual notifications after actions
* [impr] code reorganization
* [impr] better unit tests on the demo backend
* [impr] better unit tests on authentication

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* [feat] add demo backend
* [feat] add custom javascript hook
* [feat] add documentation for backends
* [feat] add the Active Directory backend
* [feat] add display name parameter for backends
* [fix ] fix many encoding error in LDAP backend
* [fix ] fix dn renaming of an entry in LDAP backend
* [impr] turn-off configuration monitoring
* [impr] better exception handling and debugging logs

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* [misc] first release