Add benchmark test suite

[ci skip]

benchmark/README.md

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+# String Natural Compare Benchmark Tests
+
+First update dependencies before running tests:
+
+```sh
+npm install # or npm update if already installed
+```
+
+Run tests:
+
+```sh
+node run
+```

benchmark/package.json

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+{
+  "description": "Dependencies for string-natural-compare bechmarking",
+  "license": "UNLICENSED",
+  "dependencies": {
+    "benchmark": "^2.1.0",
+    "string-natural-compare": "nwoltman/string-natural-compare"
+  }
+}

benchmark/run.js

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+/* eslint-disable no-console */
+
+'use strict';
+
+var Benchmark = require('benchmark');
+
+var naturalCompareMaster = require('string-natural-compare');
+var naturalCompareCurrent = require('../');
+
+
+new Benchmark.Suite()
+
+  .add('no numbers master', function() {
+    naturalCompareMaster('file.txt', 'otherFile.txt');
+    naturalCompareMaster('otherFile.txt', 'file.txt');
+  })
+  .add('no numbers current', function() {
+    naturalCompareCurrent('file.txt', 'otherFile.txt');
+    naturalCompareCurrent('otherFile.txt', 'file.txt');
+  })
+
+  .add('common numbers master', function() {
+    naturalCompareMaster('a2.txt', 'a10.txt');
+    naturalCompareMaster('a10.txt', 'a2.txt');
+  })
+  .add('common numbers current', function() {
+    naturalCompareCurrent('a2.txt', 'a10.txt');
+    naturalCompareCurrent('a10.txt', 'a2.txt');
+  })
+
+  .add('big numbers master', function() {
+    naturalCompareMaster('1165874568735487968325787328996865', '265812277985321589735871687040841');
+    naturalCompareMaster('265812277985321589735871687040841', '1165874568735487968325787328996865');
+  })
+  .add('big numbers current', function() {
+    naturalCompareCurrent('1165874568735487968325787328996865', '265812277985321589735871687040841');
+    naturalCompareCurrent('265812277985321589735871687040841', '1165874568735487968325787328996865');
+  })
+
+  .on('cycle', function(event) {
+    console.log(String(event.target));
+  })
+  .run();
+
+
+naturalCompareMaster.alphabet = 'ABDEFGHIJKLMNOPRSŠZŽTUVÕÄÖÜXYabdefghijklmnoprsšzžtuvõäöüxy';
+naturalCompareCurrent.alphabet = 'ABDEFGHIJKLMNOPRSŠZŽTUVÕÄÖÜXYabdefghijklmnoprsšzžtuvõäöüxy';
+
+new Benchmark.Suite()
+
+  .add('custom alphabet included characters master', function() {
+    naturalCompareMaster('š.txt', 'z.txt');
+    naturalCompareMaster('z.txt', 'š.txt');
+  })
+  .add('custom alphabet included characters current', function() {
+    naturalCompareCurrent('š.txt', 'z.txt');
+    naturalCompareCurrent('z.txt', 'š.txt');
+  })
+
+  .add('custom alphabet missing characters master', function() {
+    naturalCompareMaster('é.txt', 'à.txt');
+    naturalCompareMaster('à.txt', 'é.txt');
+  })
+  .add('custom alphabet missing characters current', function() {
+    naturalCompareCurrent('é.txt', 'à.txt');
+    naturalCompareCurrent('à.txt', 'é.txt');
+  })
+
+  .on('cycle', function(event) {
+    console.log(String(event.target));
+  })
+  .run();