add new rules up to eslint 2.6

eslintrc

@@ -65,6 +65,7 @@
     "no-unused-expressions": 2,
     "no-useless-call": 2,
     "no-useless-concat": 2,
+    "no-useless-escape": 2,
     "no-void": 2,
     "no-warning-comments": 0,
     "no-with": 2,
@@ -120,9 +121,11 @@
     "max-nested-callbacks": [ 1, 4 ],
     "max-params": [ 1, 4 ],
     "max-statements": [ 1, 30 ],
+    "max-statements-per-line": [ 1 ],
     "new-cap": 2,
     "new-parens": 2,
     "newline-after-var": [ 1, "always" ],
+    "newline-before-return": 0,
     "newline-per-chained-call": [ 0, { "ignoreChainWithDepth": 3 } ],
     "no-array-constructor": 2,
     "no-bitwise": 2,
@@ -168,6 +171,7 @@
     "generator-star-spacing": [ 1, { "before": true, "after": true} ],
     "no-confusing-arrow": 1,
     "no-useless-constructor": 1,
+    "no-duplicate-imports": 1,
     "no-var": 2,
     "object-shorthand": [ 1, "always" ],
     "prefer-arrow-callback": 1,