Merge pull request #62 from caspervg/master

Small fixes to topic icons
Synch up requirements.txt and setup.py, remove unused dependencies
Fix import for check_password_hash and generate_password_hash from werkzeug.security
Do not show "PM" link on posts by the current_user, as you can't PM yourself anyhow
Merge branch 'master' of https://github.com/caspervg/flaskbb