Array values for parameters

[zeelot]

We should be able to do --id=1 --id=3 --id=4 and have it result in $config['id'] = array(1,3,4) in the task.

This is related to #39 as I am splitting that ticket up.

[zeelot]

so this seems like a limitation in Kohana's CLI::options(), am I right? Maybe we need to add a parameter to allow it to merge the values into an array instead of using the last occurrence