Initial commit of rlm_rest module

Initial commit of rlm_rest module

Add library independent streaming JSON generator

Add library independent streaming POST generator

Add support for parsing JSON and POST responses

Add support for parsing do_xlat and is_json flags in JSON responses

Add function to emulate CURLs multiple calls to the JSON generator when in stream mode, to allow transfer of data as a single contiguous block

Deduplicate truncation detection code.

Improvde consistancy of documentation.

Replace 1, 0 return codes with TRUE/FALSE macros.

Slightly better version of rest_uri_build

Add tables for auth types

Add a bunch of formatting fixes and extra options for SSL certs in curl