Fix native poster snapshot-ing and qunit test
Use npm to pull in video.js@4.4. Use `removeAttribute` to get rid of the poster image when transitioning into and out of linear ad mode. Mock out `removeAttribute` for phantomjs because it has behavior that doesn't match a functional video element.
Add changelist to README
List out major changes in preparation for 0.2.0.
0.2.0
Merge branch 'master' into feature/travis