More updates on chat example
New example - json-rpc chat - not ready yet
Fixed issue #3441849, Typo in cppcms::http::context::complition_type
Fixes for older Berkeley DB
Added better error reporting
Implemented new DB modules with unit test
Added patch that improves JsonRPC handing - reduce copy
Fixed Windows issue - incorrect define
Fixed incorrect __declspec(dllexport) definition
Updated cast according to C++03 standard
