Add more tests for IDBCursor advance
Improve and rename tests for IDBCursor advance

 - duplicate file name.
Improve tests for IDBCursor advance

 - split checkpoint into its own file.
Moved code
Merge pull request #826 from yunxiaoxie/yunxiaoxie/idbcursor-advance

Add more tests for IDBCursor advance
Stop using w3c-test.org for progress-events test
Update cite attribute tests to not use w3c-test.org as the example url

Although this url shouldn't be resolved, it makes it easier to check for
real errors if we clean up this test too
Fixup multiple base element test not to use w3c-test.org
Remove unneeded comment.
Remove unneeded comment
Remove unneeded comment
Use correct invocation for testharness.js
Clean up some comments on touch events tests
Update webmessaging tests to not use w3c-test.org and to use actual paths that exist
Update some XHR tests to not refer to w3c-test.org
Update canvas tests that use cross-domain URLs
fixup! Update some XHR tests to not refer to w3c-test.org