readme, example, and failing test

Author: James Halliday

Diff for: example/sum.js

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+var reduce = require('../');
+var xs = [ 1, 2, 3, 4 ];
+var sum = reduce(xs, function (acc, x) { return acc + x }, 0);
+console.log(sum);

Diff for: index.js

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+module.exports = function (xs, f, acc) {
+    if (xs.reduce) return xs.reduce(f, acc);
+    for (var i = 0; i < xs.length; i++) {
+        if (!hasOwn.call(xs, i)) continue;
+        acc = f(acc, xs[i], i);
+    }
+    return acc;
+};
+
+var hasOwn = Object.prototype.hasOwnProperty;

Diff for: readme.markdown

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+# array-reduce
+
+`[].reduce()` for old browsers
+
+# example
+
+```
+var reduce = require('array-reduce');
+var xs = [ 1, 2, 3, 4 ];
+var sum = reduce(xs, function (acc, x) { return acc + x }, 0);
+console.log(sum);
+```
+
+output:
+
+```
+10
+```
+
+# methods
+
+``` js
+var reduce = require('array-reduce')
+```
+
+## var res = reduce(xs, f, init)
+
+Create a result `res` by folding `acc = f(acc, xs[i], i)` over each element in
+the array `xs` at element `i`. If `init` is given, the first `acc` value is
+`init`, otherwise `xs[0]` is used.
+
+# install
+
+With [npm](https://npmjs.org) do:
+
+```
+npm install array-reduce
+```
+
+# license
+
+MIT

Diff for: test/reduce.js

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+var reduce = require('../');
+var test = require('tape');
+
+test('numeric reduces', function (t) {
+    t.plan(3);
+    
+    var xs = [ 1, 2, 3, 4 ];
+    t.equal(
+        reduce(xs, function (acc, x) { return acc + x }, 0),
+        10
+    );
+    t.equal(
+        reduce(xs, function (acc, x) { return acc + x }, 100),
+        110
+    );
+    t.equal(
+        reduce(xs, function (acc, x) { return acc + x }),
+        10
+    );
+});