Fixed broken GitHub link
Merge pull request #170 from samdutton/master

Fixed broken GitHub link
Added Structual SIMilarity calculation in a JS file. Used for checking
SSIM between contiguous frames in a near-frozen frames subtest of
camtest.js.
Changed statement on where SSIM comes from and what we use from its Matlab code.
Merge pull request #154 from GoogleChrome/cameratest_detect_frozen_frames

Added frozen frames detection in test-rtc based on Structual SIMilarity calculation.
fixed according to comments
Added Grunt and Travis files for JSHint and other checking; modified .gitignore accordingly
Added Grunt and Travis files
Minor tweaks to apprtc index.html and full.html for validity
Updates to datachannel sample
Updates to getusermedia samples
Updates to peerconnection samples
Updates to peerconnection samples and added new files
Removed stray text at start of datachannel/index.html
Set Opus as Preferred codec on apprtc for Chrome on Android
Removed references to unused modules; added checking for apprtc/index.html
Added CSS linting and tweaked CSS to validate
Added .csslintrc
Add ability to download a random file with a given size from any domain.
Merge pull request #176 from GoogleChrome/add-download-file-from-any-domain

TestRTC: Now generates random data with no cross domain limitation from: /test-download-file/\d?\d00KB.data