Add converge

Based on http://ramdajs.com/docs/#converge

test/converge/converge.js

@@ -0,0 +1,3 @@
+const converge = (converger, fns) => (...args) =>
+converger(...fns.map(fn => fn.apply(null, args)));
+module.exports = converge;

test/converge/converge.test.js

@@ -0,0 +1,23 @@
+const test = require('tape');
+const converge = require('./converge.js');
+
+test('Testing converge', (t) => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  t.true(typeof converge === 'function', 'converge is a Function');
+  const average = converge((a, b) => a / b, [
+    arr => arr.reduce((a, v) => a + v, 0),
+    arr => arr.length,
+  ]);
+  t.equal(average([1, 2, 3, 4, 5, 6, 7]), 4, 'Produces the average of the array');
+  const strangeConcat = converge((a, b) => a + b, [
+    x => x.toUpperCase(),
+    x => x.toLowerCase()]
+  );
+  t.equal(strangeConcat('Yodel'), "YODELyodel", 'Produces the strange concatenation');
+  //t.deepEqual(converge(args..), 'Expected');
+  //t.equal(converge(args..), 'Expected');
+  //t.false(converge(args..), 'Expected');
+  //t.throws(converge(args..), 'Expected');
+  t.end();
+});