Make oh noes guy go away while typing

Test Plan: Check that oh noes guy appears and dissappears properly in the browser

Reviewers: pamela, john

Reviewed By: john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13430
Pamela decided she didn't want any machine generated error messages in CSS/HTML challenges

Summary: So i removed them

Test Plan: reload and check for syntax errors (this should be fairly harmless)

Reviewers: pamela, john

Reviewed By: john

Maniphest Tasks: T3222

Differential Revision: http://phabricator.khanacademy.org/D13512
Re-write Ace Recording/Playback Logic. Create Playback test suite.

Summary:
This diff has two parts:

1) It includes a rewrite of the Ace recording/playback logic to use Ace's insertText/insertLines/removeText/removeLines actions instead of the keyboard-centric tricks that we were using before. Additionally all hotnumber-related events are now removed.

2) A test suite that goes through all of the recording data generated by `utils/audio_convert.html` and tests every talkie that we have currently on Khan Academy. This was done by takes a snapshot of the code every 30 seconds. In the tests we see to those positions and confirm that the code at those times exactly match the expected output.

I'm not going to land this until I do a follow-up diff in which I make some changes to the Scratchpad model on the KA site. I need to upload all of this new recording data and replace the old data. Then I can flip this live.

Test Plan:
Run: `gulp test_record`. All the tests should pass. The current output is: "passes: 477 failures: 0 duration: 263.59s"

Right now the tests aren't run by default (you can run them manually) as they take a while to run. Hopefully I'll be able to make some perf improvements to seeking/playback - and when I do we can enable them by default!

Reviewers: brian, pamela, alexrodrigues

Reviewed By: pamela, alexrodrigues

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13297
Switch to using the operation tracker proposed by @alexrodrigues.
Fix isseus with applyDeltas improvement.
Fix binding of record events on failure. Get playback tests running again.
Send message for link clicks instead of allowing default handling

Test Plan:
- Make sure parent window receives message

Maniphest task: T3221
Update build files

Test Plan:
- None
Update another build/ file

I had reverted the build files commit for the SoundManager stuff and re-did a gulp.
For some reason it missed this file on the re-gulp.

Test Plan:
- None

Auditors: john
Stopped ACE from autoclosing tags in the middle of a line.

Test Plan:
Check that it still autocloses when nothing follows the tag
Check that it does not close when something follows the tag

Reviewers: pamela, john

Reviewed By: john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13579