eslint tuning, re-enabled some rules

.eslintrc

@@ -30,7 +30,7 @@
     "accessor-pairs": "error",
     "arrow-spacing": ["error", { "before": true, "after": true }],
     "block-spacing": ["error", "always"],
-    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
+    "brace-style": ["warn", "1tbs", { "allowSingleLine": true }],
     "camelcase": ["off", { "properties": "never" }],
     "comma-dangle": ["error", {
       "arrays": "never",
@@ -45,7 +45,7 @@
     "curly": ["error", "multi-line"],
     "dot-location": ["error", "property"],
     "eol-last": "error",
-    "eqeqeq": ["off", "always", { "null": "ignore" }],
+    "eqeqeq": ["error", "smart"],
     "func-call-spacing": ["error", "never"],
     "generator-star-spacing": ["error", { "before": true, "after": true }],
     "handle-callback-err": ["error", "^(err|error)$" ],
@@ -97,7 +97,7 @@
       "allowSamePrecedence": true
     }],
     "no-mixed-spaces-and-tabs": "error",
-    "no-multi-spaces": "off",
+    "no-multi-spaces": "warn",
     "no-multi-str": "error",
     "no-multiple-empty-lines": ["error", { "max": 1, "maxEOF": 0 }],
     "no-negated-in-lhs": "error",