fix($http): allow sending Blob data using $http

[bbaia]

Current workaround is to set $http config.transformRequest property to null.

[mb-dev]

+1

[igienger]

+1!

[pkozlowski-opensource]

@bbaia thank you for this pull request. This one looks good to me, just left one small comment.

Could you please do the change, rebase on top of the current master and force push your changes to trigger TravisCI build?

Also please make sure to sign the CLA as described here: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#cla

[bbaia]

Done!

[caitp]

looks okay to me as well

[pkozlowski-opensource]

OK, let's wait TravisCI has to say and let's merge it if given thumbs up

[pkozlowski-opensource]

@bbaia looks like TravisCI got a bit upset: https://travis-ci.org/angular/angular.js/jobs/19926829

[bbaia]

Grrr... He is suceptible!
Removed the trailing whitespace, looks OK now!

[linclark]

@btford, looks like this one was just stalled on a fail and was already approved by @caitp and @pkozlowski-opensource. Passing now, so looks like it's RTBM.

[pkozlowski-opensource]

It landed, thnx @bbaia !