Add Queues and Members support

• Adds the Queues and Members resources
• Allows trailing parameters in ContentType, such as charset, when parsing Twilio's response

Package: https://login.salesforce.com/packaging/installPackage.apexp?p0=04ti0000000XkE0

Add Messages and Media for MMS support

• Add Messages and Media resources
• Fix Capability tests
• Fix Capability Token exp timestamp
• Add and update request headers
• Use https for all tests