Update: Factor ignores out of Config (fixes #958)
Merge pull request #986 from jrajav/exclusions

Update: Factor ignores out of Config
New: Added no-trailing-spaces rule (fixes #995)
Merge pull request #998 from nodeca/no-trailing-spaces

New: Added no-trailing-spaces rule (fixes #995)
New: Added no-mixed-spaces-and-tabs rule (fixes #1003)

New: Added no-mixed-spaces-and-tabs rule (fixes #1003)
Merge pull request #1019 from ilovejary/no-mixed-spaces-and-tabs

New: Added no-mixed-spaces-and-tabs rule (fixes #1003)
New: add no-undefined rule (fixes #1020)
Merge pull request #1023 from michaelficarra/GH-1020

New: add no-undefined rule (fixes #1020)
Fix: Allow stdout to drain before exiting (fixes #317)
Breaking: CLIEngine abstraction for CLI operations; formatters no longer
are passed configs (fixes #935)