Fix typo.
Remove dead link from sidebar.
Make sure to set bus in custom data example.
Remove old preparing workstation link.
Link to advanced firmware dev. from getting started.
Add space between buttons on getting started index.
Fix a link regression...
Added section about London Traffic Tamer Challenge.
Merge pull request #49 from nathorne/addLondonChallenge

Added section about London Traffic Tamer Challenge.
Move VI firmware config tutorial to VI docs.
Update links to android library installation.
Clear up a section header in Android tutorial.
Triage some problems with the tutorial.
Remove stray brace from tutorial.
Switch example to engine speed, easier to test.
Mention deleting exiting android-support-v4.
Re-organize tutorial to start with completed example.
Fix problem with case-sensitive CONTRIBUTORS vs contributors