added SITE_* settings
use SITE_HOME to set the home page
added context processor to make site settings available in templates
fixing #327, adicionando checagem de existencia de video antes do play. Resolve pra qualquer caso.
Merge pull request #328 from mupi/timtec/issue327

add check for existing video before playing, fixes #327
Merge pull request #319 from barraponto/site_abstract

abstracting TIMTec details
fix lesson slug conflict, fixes #331
Merge branch 'issue331'
add waffle.io badge
remove lessons icon from the tool bar and put the lessons dropdown menu instead issue #5
fix size of units dropdown nav
added mupi.less, removed the video from the course page