esprima is breaking AMD loaders

[neonstalwart]

if an AMD loader is added before polymer.js, then esprima tries to register itself as an AMD module. using dojo's AMD loader this will break the loader because it is receiving a call to define that it was not expecting. see http://jsbin.com/ayemib/1/edit for an example.

fyi - i'm using the master branch and i can work around this by adding the AMD loader after polymer.

[arv]

You should always load polymer first or the shadow dom polyfill will not work correctly.

Still, we should remove the ADM loader header if it is broken.

[rafaelw]

My bad. Removed: https://github.com/Polymer/mdv/commit/84752bde240a7f6c8d8328f4485ede56606db087