New Release: 2.9.1-rc2

The JSHint team Dec 22nd, 2015

Bug Fixes

• Abort in the presence of invalid config (767c47d)
• Allow ignoring W020 and W021 (46db923), closes #2761
• Correct unused for function-scoped vars (91fa9fc)
• Disallow ambiguous configuration values (eb54a4c)
• Do not disable ES6 when moz is set (97dfd90)
• Don't throw '(NaN% scanned)' (903b698)