Add images (imported from WebApp, plus new ones from the grade 7)

Test Plan:
Will be tested as part of imageModal
Image move as a part of review 1
WIP
Added LICENSE

Summary:

Test Plan: <see below>

Reviewers:

Subscribers:
Inline Tooltip

Test Plan:
<see below>
Move to accessing images and templates directly from liveEditor.

Lots of this is associated with the image dump from the previous commit

Test Plan:
this will be tested as part of imageModal
Create imageModal tooltip

Test Plan:
Run test suite
Check imageModal in browser
Fixed tooltip-close on blur problems relating to the modal

Test Plan:
Chekc that tooltip does not close whn you use the modal.
Add handlebars dependency directly to LiveEditor

Test Plan:
rebuild live-editor.core_deps.js, check that demos work.
Factored out custom scrollSpy

Test Plan:
Check that nav updates when scrolling.
- Check that clicking nav links scrolls correctly, before and after first scroll

Reviewers: pamela, john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13858
imageModal (HTML image picker)

Summary:
 - Access images and templates directly from liveEditor.
 - Create imageModal tooltip
 - Create modal image picker
 - Add lazy loading of images

Test Plan:
Run the created test suite.
Check that the picker successfully, previews, opens, loads, tabs, scrolls, selects and closes
Check that hiding tooltips on blur still works (it's behavior was changed in this diff)

Reviewers: pamela, john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13886
Response to review 1

Test Plan:
Run test suite
Code review 2 - Moved utility functions off of $.fn and into TooltipUtils

Test Plan:
Run test suite
Check that imagemodal scroll with the correct shadow/scroll-spy/image-loading
Code review 3

Test Plan:
<see below>
Review 4

Test Plan:
<see below>
Fixed image missing errors in the tooltip tests

Test Plan:
run the tests
Moved bootstrap dependency around in response to the webapp code review for imagepicker

Test Plan:
<see below>
Added recording and playback to the HMTL image modal

Test Plan: Waiting on john

Reviewers: pamela, john

Subscribers: #cs

Differential Revision: http://phabricator.khanacademy.org/D13922
Review 1

Test Plan:
<see below>
Review 2 - Pamela

Test Plan:
<see below>
John's final comments

Test Plan:
<see below>