Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
optimized-intersection
remove unneeded other variable
remove _.index in favor of _.contains in _.intersection
remove braces
Merge branch 'optimized-intersection' of https://github.com/mehdishojaei/underscore into optimized-intersection
one-liner variable declarations
remove seen variable
Merge pull request #1517 from mehdishojaei/optimized-intersection

Optimize _.intersection for performance
Edit for style.
Merge pull request #1544 from braddunbar/intersection

Edit for style.