Fixes T3266 - Tooltips don't move when scrolling

Test Plan: Verify that scrolling works in browser

Reviewers: pamela, john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13826
Fixed tooltips stay on onBlur, https://groups.google.com/a/khanacademy.org/forum/#!topic/compsci-feedback/NVoWZHzkXAI

Test Plan: Check that tootlips disappear on unfocus

Reviewers: pamela, john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13827
Fixes T3268 - Oh noes guy goes away on restart

Test Plan: Check that oh noes guy doesn't move when you restart

Reviewers: pamela, john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13828
Fixed bug where if number started at the very beggining of the line the scrubber would appear at the end

Test Plan: Verify that all tooltips appear at the right location

Reviewers: pamela, john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13829