Remove pipelines
Add helper method for merging errors
Get basic interruption working
Add basic integration test
Merge branch 'master' into compose
Simplify Base#interact
Add comments explaining empty rescue blocks
Use valid YARD
Ignore unused parameter
Change key to a symbol

This used to be a string because of with_indifferent_access, but that's
not necessary any more.
Improve Base#interact tests
Improve error messages
Rename Base#interact to #compose
Update changelog and readme
Give examples better names
Version bump to 0.9.0