Implement twilio request validation as per https://www.twilio.com/docs/security#validating-requests
Pass in the host of the request seperately, since it may not be part of URL.String()
Add support for Twilio Capability Tokens
Fix appParams for outgoing calls. It was incorrectly being encoded
Merge pull request #1 from marcuswestin/master

Implement Request Validation and Capability Tokens