Updates and tweaks for debugging.

[jmervine]

Requests from @dlitvakb

• Add back @secure_connection for dev support and rws testing.
• Add back :debug_json and :debug_request for dev support and rws testing.
• Add custom header support and set default Content-Type header to application/x-www-form-urlencoded. Note on this; custom content-type didn't work before my changes, it could be passed to the MaxCDN (was NetDNARWS) module, but didn't actually get passed down to the underlying OAuth agent. The primary functional change I made was to make custom content-type support work, and then set it to application/json, which seems to be required for POST and PUT requests with body messages.

[jmervine]

While implementing these, I left the default content-type as application/json as body based POST and PUT requests fail with application/x-www-form-urlencoded.

[jmervine]

Released with version 0.1.3.

[jmervine]

Interesting point, I can sucessfully POST and PUT from the Node.js client with Content-Type: application/x-www-form-urlencoded.

@jdorfman @dlitvakb Let me know if you want me to do some research in to getting this working with x-www-form-urlencoded. Otherwise, close this again.

[dlitvakb]

@jmervine Python and PHP libraries also use application/x-www-form-urlencoded dont know why it is not working for you, as it has always been working for me even in this library