dashboard: Update to React v0.12.2

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
dashboard: Use production version of React unless ENVIRONMENT=development

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
Merge pull request #671 from flynn/dashboard-update-react

dashboard: Update React to v0.12.2
website: twif 12-29-14

Signed-off-by: Dominic Serio <dominic@flynn.io>