JSCS: Use more style checks.

js/.jscsrc

 {
+  "disallowEmptyBlocks": true,
   "disallowKeywords": ["with"],
   "disallowLeftStickedOperators": ["?", "+", "-", "/", "*", "=", "==", "===", "!=", "!==", ">", ">=", "<", "<="],
+  "disallowMixedSpacesAndTabs": true,
+  "disallowMultipleLineStrings": true,
   "disallowRightStickedOperators": ["?", "/", "*", ":", "=", "==", "===", "!=", "!==", ">", ">=", "<", "<="],
   "disallowSpaceAfterPrefixUnaryOperators": ["++", "--", "+", "-", "~"],
   "disallowSpaceBeforePostfixUnaryOperators": ["++", "--"],