[Unicorn] New task for developers and Unicorn output tutorial

Hi Dan,

I have made a new task for Unicorn that allows you to test your Unicorn 
output [1].
Additionally I have written some tutorial files that demonstrate all of 
Unicorn output functionalities [2].
You can use the new test task to see the result of these files [3].

Regards,
Tom

[1] http://qa-dev.w3.org/unicorn/?ucn_task=test
[2] http://qa-dev.w3.org/unicorn/tutorial/
[3] 
http://qa-dev.w3.org/unicorn/check?ucn_uri=qa-dev.w3.org/unicorn/tutorial/test_1.xml&ucn_task=test 
<http://qa-dev.w3.org/unicorn/check?ucn_uri=qa-dev.w3.org/unicorn/tutorial/test_1.xml&ucn_task=test#>