Ldapcherry

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* [fix ] fix double escaping issues introduced in 1.0.0
* [fix ] fix missing url escaping in links with querystring parameters (delete and modify page mostly)
* [fix ] fix log level not being honored in the backends
* [impr] clarify the role of 'key: True' of attributes.yml in the documentation
* [impr] add a few more comments in the .ini file to explain better the \*_filter_tmpl and group_attr parameters
* [impr] add debug log to help debug ldap search filters

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* [feat] add stdout as a valid log method (useful when running with docker)

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* [fix ] fix error handling when adding user that already exists

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* [sec ] fix XSS injection in the url redirect in the login page (thanks to jthiltges)
* [fix ] fix configuration consistency check for attribute file (error if a given backend is not declared in main .ini file but in attributes)
* [fix ] remove a few deprecation warnings
* [fix ] fix potential issue with group names containing non-ascii characters
* [feat] support for python 3
* [feat] support for python-ldap 3.X.X
* [impr] better log error message if inconsistency between role, attribute and main .ini file for backends
* [impr] more systematic use of html and url escaping in the html rendering to prevent against content injection (thanks to jthiltges)
* [impr] more testing for various versions of python and python-ldap

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* [fix ] regression in 0.5.1, setup.py could not work without the dependencies already installed

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* [impr] cleaner align of labels (input-group-addon width)