Add support for -X/--exclude/EXCLUDE_FILES.

Review Request #6317 — Created Sept. 12, 2014 and submitted — Latest diff uploaded

Information

RBTools
master
422122c...

Reviewers

rbtools now recognizes the -X and --exclude command line options for
excluding files from diffs and review requests. The EXCLUDE_FILES
option in .reviewboardrc adds the same functionality, but can be
committed to the repository.

Currently no backends support this option.

Unit tests pass.
Running rbt diff with -X or --exclude flags, or with
EXCLUDE_FILES set in .reviewboardrc causes the expected error
message