closes #98

- reenables links in the header
- restores activities as the root
add basic confereces_controller specs
fix conferences/index template
add coveralls
enable coverage on travis
add specs for applications_helper
add commet specs
add application scopes specs
more specs for applications
add spec for Application#estimated_support
rewrite Application#estimated_support
refactor application flags
Update Help-section (fixes #99)
Change the Users overview back
introduce Event-Model (closes #102)
Merge pull request #103 from rails-girls-summer-of-code/rgsoc_2014

Getting ready for RailsGirls Summer of Code 2014