tweak root script to accept cli args

Address issue #17 with extra `ask` method in LazybonesScript and unit test.
Integrated test not possible until #18 is done.
add new ask method to groovy template

Allow command line arguments in lazybones script for the groovy template.
This is related to issue #17.
Add new ask method to README
Merge branch 'root-script-cli-ask-pull' of https://github.com/tbarker9/lazybones into tbarker9