Rename jsx files .jsx

[braco]

for example,

react-googlemaps/src/ui/components/ReactMap.js

is jsx, not js.

This makes building a little hairy, as it's easier to apply a jsx loader to *.jsx. Webpack works this way.

[kellec]

If React is included in the module namespace then jsx loader will work on .js files so we shouldn't need the .jsx extension.

[dempfi]

+1