Sunflower Again

• Update the version because of a stupid "feature"™ of PyPI

Sunflower

• Enhanced performances (by Mathieu Dupuy)
• Add MD5-APR1 and BCRYPT for htpasswd-based authentication (by Jan-Philip Gehrcke)
• Use PAM service (by Stephen Paul Weber)
• Don't discard PROPPATCH on empty collections (by Markus Unterwaditzer)
• Write the path of the collection in the git message (by Matthew Monaco)
• Tests launched on Travis