feat(preprocessor): Capital letters in binary files extenstions

[lonelyelk]

Use lower case file extension to detect if it is binary

Closes #1508

[googlebot]

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).

📝 Please visit 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 and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[lonelyelk]

I signed it!

On Wed, Jul 22, 2015 at 12:38 AM, 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
  https://help.github.com/articles/setting-your-email-in-git/.
• If you signed the CLA as a corporation, please let us know the
  company's name.

—
Reply to this email directly or view it on GitHub
#1509 (comment).

[googlebot]

CLAs look good, thanks!

[dignifiedquire]

Thanks

[dignifiedquire]

Published in 0.13.3

[lonelyelk]

Yay! Even released! Thank you!