Only stop if the transition on this element ended

This way it doesn't end when some random element elsewhere on the page has an ending transition.

It must be noted that this is not a complete fix. If you have multiple transitions on the element, it still ends when the first ends.

I ran into this not working (the transition ends almost immediately, because some unrelated transition ends). This fixes it for me, but I was wondering whether this cornercase was considered, and whether the other cornercase (multiple transitions) was considered.

I think it's very hard to get this correct, and think it might be better to make the timeout explicit, or at least allow to set it explicit, and fall back to this behaviour. But I'm really interested in feedback on this one.
Added event parameter
Make sure it works when we have no css transitions
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