added contents to the third sequence exercise, remove rounded vertices from sample codes
Merge pull request #32 from sandyphan/master

Merge pull from steph, added contents to exercises
work in progress
Merge branch 'master' of https://github.com/StephMc/web-animations-test-framework
Merge pull request #33 from SHeimlich/master

Working to create a tutorial version of testharness.js
Working towards tutorialTest.js becoming a dummy version of testharness.js for extra-asserts.js