Issue Summary

Sendgrid version: 4.7.1

Trying to make use of sendgrid in typescript. Cannot make use of the SendGrid namespace.

Would be great to have some working examples of using typescript with sendgrid.

Steps to Reproduce

1. clone sendgrid-ts-demo repo, `
2. npm install
3. npm test (which runs tsc)
4. error

Technical details:

• sendgrid-nodejs Version: 4.7.1
• Node.js Version: 5.5.0
• Typescript Version: 1.8.10, 2.0.6