TravisCI: Removed manual PostGIS installation

http://about.travis-ci.org/blog/2013-11-18-upcoming-build-environment-updates/

TravisCI has PostGIS 2.1 preconfigured now :)
views/user: Moved active_page setting into template
views/user: Use g.user instead of passing user attribute to template
css: Added explicit ul.list-with-dividers class
model/follower: Don't allow to follow yourself
views/user: Go back to request.referrer if possible in un/follow()
views/user: Added /user/.../followers and following views
templates/users: Replaced follower lists on profile with links to new pages

see previous commit
model/follower: Do not join User model automatically

Do this manually if necessary
Merge pull request #204 from Turbo87/followers

Added dedicated followers/following pages for each user
i18n: Updated Finnish translation
i18n: Updated translation template
i18n: Updated German translation
Updated AUTHORS file
Merge pull request #205 from Turbo87/i18n

Updated translations and template