test glob operators, fix glob + error

Review Request #2104 - Created April 21, 2015 and submitted

Information
Nick Howard (Twitter)
pants
1439
0b51b68...
Reviewers
pants-reviews
dturner-tw, stuhood, zundel

set doesn't implement __add__, so usages of + were causing problems with the new wrapped globs. This patch adds regression test for operators, and fixes a few issues in add sub handling.

added regression tests, made them pass. CI passing: https://travis-ci.org/pantsbuild/pants/builds/59431317

David Turner
Nick Howard (Twitter)
David Turner
Stu Hood
Nick Howard (Twitter)
Review request changed

Status: Closed (submitted)

Change Summary:

submitted at https://github.com/pantsbuild/pants/commit/f2950223a14147077ec770a0ec96db1dbbb3732b

Eric Ayers
Ship It!

nit: document parameters in pydoc.

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