call stop() method on localStream to release camera
Merge pull request #143 from GoogleChrome/stopLocalStream

bandwidth_test - Call stop() method on localStream to release camera. Fixes #138.
reset counters so that the test can be run again
initialize counters at the start of test instead of the global scope
Merge pull request #144 from GoogleChrome/resetIndex

Reset counters so that the test can be run again for camresolutiontest.js. Fixes #145.