Added gender installation script and modified the model-file. #56
updated installation script, variable names changed #56
Changing gender in the edit panel works (closed #56)
Gender Stuff updated, mistakes fixxed and improved. (#56)
Fixxed Bug of last commit. (#56)
You may now disable the gender option and the default value is now None (#56)
Merge remote-tracking branch 'origin/develop' into add_gender_column_branch

Conflicts:
	adhocracy/controllers/user.py
	adhocracy/model/user.py
Updated the migration script, the default value is now None for gender and the value "unspecified" is now at first place for users without any gender set
Revert "Updated the migration script, the default value is now None for gender and the value "unspecified" is now at first place for users without any gender set"

This reverts commit fb86f71425d193e4370f1ac99066f46281d04f46.
commit withouth deleteting the base.py
Changes of last commit, which were not uploaded yet.
Merge commit 'a7fed4b' into develop
Renumber migration
correct merge errors