File upload support

[coli]

file input could bind the element or the files array into a model

And $http can use FormData to do a form post that support file upload.

Eg

<input type="file" ng-model="data.file">

$http({
  type:"formPOST", 
  data: data
});

[kstep]

I second this request, but personally prefer XHR file uploads with file-uploader + my custom directive.

[pkozlowski-opensource]

@coli this sounds like a duplicate of #1375, right?
Closing this one, please reopen if you had sth else on your mind.