Add Feature: Allow 'execute program' (^) as a task in in rulesets

[itbane]

Pull Request (PR) description

This PR adds a new task to the rulesets which allows the usage of the 'execute program' feature.

This Pull Request (PR) fixes the following issues

Fixes #80

[bastelfreak]

Hi @itbane, thanks for the PR. One travis job failed, I restarted it. Can you please take a look at the used email address in your commits? It isn't associated with your github account.

[dhollinger]

@itbane Thanks for the PR. New unit and acceptance tests are needed for the new feature before the PR can be approved. We can help you with this if you need it.

[itbane]

Hi, sorry, been a while. After getting rspec working locally (first time for everything...), I've added an unit test for the new feature. Is this enough or is anything else missing? As I've never worked with Travis before, there sometime seem to be errors building the test environment itself (e.g. this) - are these common and what should I, as a contributor, do about them?