add picture element and related attributes
add picture to xjs.knownTags
use attribute for media, srcSet and sizes
Add newline before JSX spread when appropriate

Previously, we were losing the newline before a JSX spread attribute which would cause the lines to not match up; this fixes the problem.
Fix DOMProperty bitmask checking
Comment typo
added the missing **

Missed it the last time. Apologies.
Update Like button example verbiage

Changes text "You unlike this" to "You liked this". Makes a bit more grammatical sense.

Closes #2146.
corrected highlighted/updated line in tutorial example
Merge pull request #2147 from naman34/patch-2

added the missing **
Fix check for commit ranges in racing PRs.

See #1768 / #2000 for original issue.
See https://github.com/travis-ci/travis-ci/issues/1719#issuecomment-51705110 for problem description and origin of this fix.
This is still a temporary fix until travis-ci/travis-core#383 is merged.
Merge pull request #2148 from nordstrom-innovation/docfix

corrected highlighted/updated line in tutorial example
Bump esprima + jstransform versions
Add support for a --strip-types flag to bin/jsx
Merge pull request #2153 from jeffmo/jsx_strip_types

Add --strip-types flag to bin/jsx
Merge pull request #2152 from RReverser/fix-pr-check

Fix check for commit ranges in racing PRs.
Merge pull request #2116 from spicyj/nl-jsx-spread

Add newline before JSX spread when appropriate
Update video.md with Forward JS 2014 talk

Added "React and Flux: Building Applications with a Unidirectional Data Flow" by Bill Fisher and Jing Chen.
Correct highlighted block
Move htmltojsx.js to React-Magic project.

The HTMLtoJSX file is really a part of the React-Magic project, and should belong there rather than here:
 - It doesn't really follow the release cycle of React at all
 - It is totally standalone with no dependency on React
 - The only usage of this script is in React-Magic and on the HTML to JSX page on the React website (http://facebook.github.io/react/html-jsx.html)

I've hotlinked it from the Github site for that project since this was the easiest way to pull it in.

Due to the fact that Github Pages lacks redirects (among other basic web hosting functionality), I've replaced the `html-jsx-lib.js` file with a comment explaining where the file has moved to, just in case anyone was hotlinking it from the React site.