Chore: Convert JSHint to ESLint

Newer rule system and auto-fixing errors

.eslintrc

+{
+  "env": {
+    "node": true
+  },
+  "globals": {},
+  "rules": {
+    "no-bitwise": 2,
+    "camelcase": 0,
+    "curly": 2,
+    "eqeqeq": 2,
+    "no-unused-expressions": [
+      2,
+      {
+        "allowTernary": true
+      }
+    ],
+    "wrap-iife": [
+      2,
+      "any"
+    ],
+    "indent": [
+      2,
+      2,
+      {
+        "SwitchCase": 1
+      }
+    ],
+    "linebreak-style": 2,
+    "no-multi-str": 2,
+    "new-cap": 2,
+    "no-caller": 2,
+    "quotes": [
+      2,
+      "single"
+    ],
+    "strict": 0,
+    "no-undef": 2,
+    "no-unused-vars": 2
+  }
+}

.jshintrc

-{
-  "bitwise": true,
-  "camelcase": false,
-  "curly": true,
-  "eqeqeq": true,
-  "expr": true,
-  "immed": true,
-  "indent": 2,
-  "laxbreak": true,
-  "mocha": true,
-  "multistr": true,
-  "newcap": true,
-  "noarg": true,
-  "node": true,
-  "quotmark": "single",
-  "strict": false,
-  "undef": true,
-  "unused": true
-}
\ No newline at end of file

package.json

@@ -30,7 +30,7 @@
     "coverage": "node scripts/coverage.js",
     "install": "node scripts/install.js",
     "postinstall": "node scripts/build.js",
-    "pretest": "node_modules/.bin/jshint bin lib scripts test",
+    "pretest": "node_modules/.bin/eslint bin/node-sass lib scripts test",
     "test": "node_modules/.bin/mocha test",
     "build": "node scripts/build.js --force",
     "prepublish": "not-in-install && node scripts/prepublish.js || in-install"
@@ -69,8 +69,8 @@
   },
   "devDependencies": {
     "coveralls": "^2.11.8",
+    "eslint": "^2.9.0",
     "istanbul": "^0.4.2",
-    "jshint": "^2.9.1",
     "mocha": "^2.4.5",
     "mocha-lcov-reporter": "^1.2.0",
     "rimraf": "^2.5.2"

test/.eslintrc

+{
+  "env": {
+    "mocha": true
+  }
+}