Add module export. (Fixes #14)

[peakwinter]

Fixes #14 @ssirois

Changes proposed in this pull request:

• Add a module.export at the end of the file to export the primary function for use in an NPM package.

Status

• [x] READY
• [ ] HOLD
• [ ] WIP (Work-In-Progress)

How to verify this change

Requires push access to the Ringme.js NPM account.

Additional notes

none