feat(eslint): add no-negated-condition (eslint v1.6.0)

Author: SebastienElet

lib/common.js

@@ -199,6 +199,7 @@ module.exports = {
       { max: 2 },
     ],
     'no-native-reassign': ERROR,
+    'no-negated-condition': OFF,
     'no-negated-in-lhs': ERROR,
     'no-nested-ternary': OFF,
     'no-new': WARN,