added difference and symetric difference filters
Signed-off-by: Brian Coca <briancoca+dev@gmail.com>
added union filter
Signed-off-by: Brian Coca <briancoca+dev@gmail.com>
now correctly spell symmetric
Signed-off-by: Brian Coca <briancoca+dev@gmail.com>
Merge pull request #4970 from bcoca/set_diff

more set filters