cc Checkpointed messages.json file.
cc Minor housekeeping.
Updated test assertion number
versionchange should be seen when deleting db
Fixed the file names and the titles to represent what the test does.
Fixed the test program to check the created URL is a correct Blog URI.
Fixed the titles of the documents and the explanation of what the test does.
Merge pull request #848 from inexorabletash/master

Correct IndexedDB test issues
Unit tests for SourceBuffer#abort().
Add tests for hitregions (addHitRegion throws NotSupportedError)
tweak position of text
Added test for 2d hitregions members exists
add test that check 2dcontext imageSmoothingEnabled attribute
Add a test for missing a 'rel' attribute
title change and  check imageSmoothingEnabled for each divided canvas.
Mention installing html5lib to run the tests in the README.md
Improved test, separate assertions to each test.
fix testcommon.js path
Merge pull request #856 from SangsooNam/sub-imports-missing-rel

Add a test for missing a 'rel' attribute
Merge pull request #861 from sizuhiko/submission/sizuhiko/fix_testcommon_js_path

fix testcommon.js path
Added test for track api textTracks exist