v0.12.2

React Core

• Added support for more HTML attributes: formAction, formEncType, formMethod, formTarget, marginHeight, marginWidth
• Added strokeOpacity to the list of unitless CSS properties
• Removed trailing commas (allows npm module to be bundled and used in IE8)
• Fixed bug resulting in error when passing undefined to React.createElement - now there is a useful warning

React Tools

• JSX-related transforms now always use double quotes for props and displayName