Add feature for the shell task.
Add rspec support and simple tests.
Add specs for registering targets in a package.
Move Package to its own file.
Add initial travis build file.
Add the package method to the Weyland module.
Remove ruby version spec from Gemfile
Update Gemfile
Implement the shell task.
Add specs for ShellTask.
Implement the mkdir task.
Add test for existing directories to mkdir feature
Merge branch 'add-base-tasks' into development