Update a few instructions on how to run tests

Forgot to update a few things when we switched to using manifests
Wait for frames to start being captured before return from start capture

We were dropping a few frames with pointgrey before, probably with decklink
too
Remove errant print statement from pointgrey capture utility
getdimensions should be executable
Use a median filter with pointgrey

This makes images a bit less noisy without compromising on important detail
Make capture area settable via environment variable
Allow setting a framediff threshold when getting fps/unique frames

Important with the pointgrey captures, which are still rather noisy
Fix dashboard when no taskjs/lg-g2x

Just use the first test, and the first device. We have the data for that.
Fix and improve debugging option

Debugging is now a global option. Also make it work again with the new
version of mozbase.
Add a bit of logging info during Android startup test
Make it optional which directory on the dashboard server to sync to
Show gaia revision in dashboard

(should add gecko, build revisions soon)
Fix contacts scrolling test to not, er, scroll so much