Move instance setting to logo row

Fixes #145
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)
Merge branch 'develop' into instance-settings-in-logo-row
Copied over basics from hhu-adhocracy branch
Merge branch 'develop' into instance-settings-in-logo-row
Milestone detail page: modify propose login/join (fixes #154)

Don't know what was wrong with the previous code...
Merge branch 'instance-settings-in-logo-row' into develop
Fix password reset URL

Another post base_url change fix.
Add optional member paramater to ret_success, ret_abort and ret_status
Redirect to instance settings page after instance creation (fixes #155)

and display success flash message.
Rename user import from "import" to .. userimport
Fix tests after addition of invisible badges

Addendum to 48ec5f6daa3c7e489d9f023ee68141ac1f9d9ccf
Fix tests after base_url change

Addendum to ad4c95357faeea8c96f28346fbde2f808162c290
Fix tests after markdown library change

Addendum to da03b3f033cce2b957a71cf6cb334a8c207c5047
Remove unneeded import of BeautifulSoup stuff
Fix and extend URL tests
Update importexport (intermediary commit)
Merge test_url from develop