Avoid innerText for better newline behavior

Fixes #1080.
include mixin keys whose values are falsy

the previous behavior is to skip mixin keys whose values are `undefined`, `null`, `''` and (this is a bug) 0. Now, every key is included.
Merge pull request #1081 from spicyj/textcontent

Avoid innerText for better newline behavior
Pull in syranides jsx whitespace codemod transform fixes
Merge pull request #1094 from jeffmo/jsx_whitespace_codemod_fixup

Pull in syranides jsx whitespace codemod transform fixes
Sync out transforms from fb internal
Merge pull request #1095 from jeffmo/sync_transforms

Sync out transforms from fb internal
Update vendored modules, delete unused

Closes #1090
Fix comma splice
Merge pull request #1096 from spicyj/comma-splice

Fix comma splice
Add community round-up #16
Update AUTHORS for 0.9
Update copyright header in browserify config

Part of #1006, but sooner.
Upgrade Commoner dependency to v0.9.1 to fix mkdirP bug.