Client side callbacks implemented.
Merge branch 'master' of https://github.com/HSWebteam/ultraform.git

Conflicts:
	application/controllers/client_testing.php
Merge branch 'master' of https://github.com/HSWebteam/ultraform.git
Callbacks without arguments now work.
Preliminary work for callback arguments.
Merge branch 'master' of https://github.com/HSWebteam/ultraform.git
Merge branch 'master' of https://github.com/HSWebteam/ultraform.git
Callback through client scripting now works properly.
Merge pull request #24 from HSWebteam/server_callbacks

Server callbacks