set a default STATIC_ROOT.

Fixes #488
fullstack selenium tests
merge site-tour into master and fix conflicts
fixes my courses and my notes links on navbar
fix positionfield problems
see below

better youtube paste, removed debug prints, unicode filename support,
remove unused code, fix a typo in translation, and static_root
Merge pull request #493 from barraponto/static_root

Fix #488 com STATIC_ROOT padrão.
fix fileupload
add waffle.io
send a message in the end of a build
escaping shell vars from makefile
Merge branch 'master' into design