Collections and all sorts

The major update in this release is the introduction of collections.

A raft of minor changes including

• Generator/model updates
• JSON encodable resources
• Example fixes
• Automatic AuthorizeURL generation
• Autoloader improvements
• __isset() magic functions on objects
• Pageable objects
• Corrected access to files API

There are a few other minor bits ant pieces like doc updated in there too. (Closes #73 )