Permission fix for database in Vagrant environment

Also adds python-lxml dependency for migration to work. Fixes #68.
Merge pull request #69 from vikoivun/master

Permission fix for database in Vagrant environment
Add tweetstream to requirements
Make social updater recover from FB errors
Add an option to update_social to update only selected feed types
Switch some social update fields into TextFields for unlimited length
Fix import problem with an MP
Add hour and minute to import log filename
Fix a couple of import bugs
Make activity default sorting to prevent loading weirdness
Show statistic based on member list sort order

Closes #36
Feed filter checkbox behavior

Including "show-all" function

Closes #39