[DEV-107] Add pseudovariable '$jsrpc' to set request timeouts.
[DEV-107] Update docs for pseudo-variable
[DEV-109] Add error route to jsonrpc notifications
[DEV-109] Add docs for notification error route
[DEV-7] Mention JSON-RPC 2.0 spec in the jsonrpc-c docs
Fix return value of request responses.
Merge branch 'jansson'
Fix json messages when there is a failure.