String to boolean Lo-Dash extension

<!DOCTYPE html>
<html>

  <head>
    <script data-require="lodash.js@*" data-semver="2.4.1" src="http://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.js"></script>
    <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/mocha/1.13.0/mocha.min.css" />
    <script src="//chaijs.com/chai.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/mocha/1.13.0/mocha.min.js"></script>
    <script src="strToBool.js"></script>
  </head>

  <body>
    <script>mocha.setup('bdd')</script>
    
    <div id="mocha"></div>
    
    <script src="test.strToBool.js"></script>
    
    <script>
      mocha.run();
    </script>
    
  </body>

</html>

_.strToBool()
-------------

A mixin for Lo-Dash that will convert any "truthy" strings to boolean true.

```
_.strToBool('y') === true
```

Open ```strToBool.js``` for the code or run Live Preview for the Mocha/Chai 
test.

var assert = chai.assert,
    expect = chai.expect,
    should = chai.should();

describe('_.strToBool', function(){
  it('yes', function() {
      assert.isTrue(_.strToBool('yes'));
  });
  it('YES', function() {
    assert.isTrue(_.strToBool('YES'));
  });
  it('Y', function() {
      assert.isTrue(_.strToBool('Y'));
  });
  it('true (str)', function() {
      assert.isTrue(_.strToBool('true'));
  });
  it('TRUE (str)', function() {
      assert.isTrue(_.strToBool('TRUE'));
  });
  it('true (bool)', function() {
      assert.isTrue(_.strToBool(true));
  });
  it('false (bool)', function() {
      assert.isFalse(_.strToBool(false));
  });
  it('1 (str)', function() {
      assert.isTrue(_.strToBool('1'));
  });
  it('1 num)', function() {
      assert.isTrue(_.strToBool(1));
  });
  it('0 (num)', function() {
      assert.isFalse(_.strToBool(0));
  });
  
});

_.mixin({
  strToBool: function(string) {
    var areTrue = [
      'yes',
      'true',
      true,
      'y',
      1,
      '1'
    ];
    
    if(_.isString(string)) {
      string = string.toLowerCase();
    }

    if(_.indexOf(areTrue, string)  > -1) {
      return true;
    }
    
    return false;
  }
});