Allow chaining on fontSet method

[shprink]

Codepen: http://codepen.io/shprink/pen/LVLmYm

Open the console.

 $mdIconProvider
            .fontSet('fa', 'fontawesome')
            .defaultFontSet('fontawesome');

Does not work.

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[shprink]

I signed it!

On Thu, Jun 11, 2015 at 5:11 PM, googlebot notifications@github.com wrote:

Thanks for your pull request. It looks like this may be your first
contribution to a Google open source project, in which case you'll need to
sign a Contributor License Agreement (CLA).

[image: 📝] Please visit https://cla.developers.google.com/
https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll

verify. Thanks.

• If you've already signed a CLA, it's possible we don't have your
  GitHub username or you're using a different email address. Check your
  existing CLA data https://cla.developers.google.com/clas and verify
  that your email is set on your git commits
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Reply to this email directly or view it on GitHub
#3238 (comment).

[googlebot]

CLAs look good, thanks!