Description:
    Stubs out a new test (using Test::Unit). Pass the model name, either 
    CamelCased or under_scored.

    This generates a unit test in /test.

Examples:
script/generate test_unit account_receiver

creates an Account test:
    Test:       test/test_account_receiver.rb

The same result will occur for:
script/generate test_unit AccountReceiver
