fix underscore method for single letter words

[az7arul]

This deals with #86

[jprichardson]

Looks good to me.

[az7arul]

@jprichardson whats the build process ? should I just merge this ?

[jprichardson]

Change process:

1. Submit PR for significant changes (wait for acknowledgement), minor changes like bugfixes it's ok to commit directly yourself.
2. Adhere to semver. Best explanation I've found of semver http://semver-ftw.org/
3. You can use tin to alter versions for all package files https://github.com/jprichardson/tin.
4. Make sure to update CHANGELOG.md.
5. Run make min. (We should move to gulp)
6. Commit the new version number with commit message being the version number. Should contain only the version number changes in package files, changelog changes, and new min file.
7. Create a tag with with the version number. Tag message should be the changelog changes.
8. Push and npm publish. Btw, what is your npm username?

[az7arul]

az7arul

[jprichardson]

Done.

[az7arul]

Published to npm :)

[jprichardson]

👍 Awesome, thanks!