v3.0.0-rc1

Breaking changes:

• Server::Request::path is now split into path and query_string. This means that for instance server.resource["^/info$"]["GET"] will match both GET /info HTTP/1.1 and GET /info?a=b HTTP/1.1 requests.
• Server::send has been moved to Server::Response::send
• Deprecated functions has been removed

Notable changes:

• Standalone Asio is now supported
• Handlers are now safely canceled on Client and Server destruction. This is especially useful when using an external io_service
• A major restructuring of the source code
• Added convenience write functions to Server::Response
• Added asynchronous client request functions
• Client now supports parallel requests
• Client now attempts to reconnect timed out connections
• Added convenience Client::Response::Content::string() function
• Added Status Code header with convenience functions to create and read status codes
• Added function to create query string in addition to query string parsing
• Added Client::stop
• Server::stop now closes current connections