jscs: Require `function () {}`

Change jscs's required style from `function()` to `function ()`.

We always require a space after the `function` keyword, and before {}
braces, but we do not allow a space between a function name and its ()
braces:

    var foo1 = function () {};  // Right.
    var foo2 = function() {};  // Wrong.
    var foo3 = function (){};  // Wrong.

    var foo4 = function foo4() {};  // Right.
    var foo5 = function foo5 () {};  // Wrong.
    var foo6 = function foo6(){};  // Wrong.

    function foo7() {}  // Right.
    function foo8 () {}  // Wrong.
    function foo9(){}  // Wrong.

This deviates from the Google style guide and jscs presets that we use.

.jscsrc

@@ -6,5 +6,19 @@
     "node_modules/**",
     "h/static/scripts/vendor"
   ],
-  "maxErrors": 10
+  "maxErrors": 10,
+  "disallowSpacesInAnonymousFunctionExpression": null,
+  "disallowSpacesInFunctionDeclaration": {
+    "beforeOpeningRoundBrace": true
+  },
+  "disallowSpacesInFunctionExpression": null,
+  "disallowSpacesInNamedFunctionExpression": {
+    "beforeOpeningRoundBrace": true
+  },
+  "requireSpacesInFunctionDeclaration": null,
+  "requireSpacesInFunctionExpression": null,
+  "requireSpacesInAnonymousFunctionExpression": {
+    "beforeOpeningRoundBrace": true,
+    "beforeOpeningCurlyBrace": true
+  }
 }