Implemented a Web server class
Added support for internal Web server for LoginTests
Fixes for the WebServer
Ported AvatarTests and ServerSyncTests to the internal web-server
Replaced compact jQuery with uncompressed one
Rewrote shutdown procedure for the server-under-control

Now it uses clean shutdow by communicating the server that it should
terminate via a reverse tester-to-server communication protocol.
Cleaner shutdown of the web server (not exceptions in handlers)

+ fix for the .xml mime-type
Rewrote Testing plugin to use JSON files instead of AppConfig
Corrected ports for web tests
Restructured FiVESServerInstance to use JSON for testing config