Change most uses of ComponentClass<P> to a type that represents the class

This more accurately reflects that createClass returns a class, not an
instance of a class. This will be more important as React v0.13 is released
which supports using ES6 classes as components.

react/react-tests.ts

@@ -32,7 +32,7 @@ var INPUT_REF: string = "input";
 // Top-Level API
 // --------------------------------------------------------------------------
 
-var reactClass: React.ComponentClass<Props> = React.createClass<Props>({
+var reactClass = React.createClass<Props>({
     getDefaultProps: () => {
         return <Props>{
             hello: undefined,