rework homepage with new video
Updated Download Page

* Make it clear what the easiest path to getting started is (Activator)
* Content duplication of the proposed changes to the getting started doc for sbt and Maven
fix version in maven dep
Merge remote-tracking branch 'refs/remotes/origin/pr/3' into 2.0

Conflicts:
	_includes/frontpage.html
Merge remote-tracking branch 'refs/remotes/origin/pr/2' into 2.0
Merge branch 'refs/heads/master' into 2.0
Update the "Community" page:

- Remove link to old Assembla project (we're using github exclusively)

- Change the "Get Involved" section to point to Activator first. We
  want to encourage people to create Activator Templates instead of
  submitting PRs for slick-examples.
Merge pull request #4 from slick/tmp/update-community-page

Update the "Community" page: