add guava
DataTable set-difference
rename to unorderedDiff
Revert "add guava"

This reverts commit ef37a5c639688564b0243f18ff04ae7de340fb1d.
change algorithm for duplicate lines
Merge branch 'datatable_diff_set' of https://github.com/yoelb/cucumber-jvm into yoelb-datatable_diff_set
Attribution. Closes #731, #732
Merge branch 'yoelb-datatable_diff_set'