Make help topic form optional
Add ticket and user fields to supported vars.
Remove phone_ext - phone field is overloaded with X123 as the extension.
Assume incoming JSON/XML posts are plain text
Correct implementation and description of API

Allow for type and encoding specification of the message body and better
describe the integration with custom form fields.
Properly transcode message body in API requests
Merge pull request #32 from greezybacon/issue/custom-form-api-doc

Correct issues with the API

Reviewed-By: peter Rotich <peter@osticket.com>