Added bower.json for dependency management.

The current version has no bower.json to declare Foundation as dependency, so bower thinks it's extreneous:

```
>>> bower list
bower check-new     Checking for new versions of the project dependencies..
JointsWP C:\xampp\htdocs\wordpress\wp-content\themes\JointsWP
└─┬ foundation#5.2.1 extraneous (5.2.2 available)
  ├── fastclick#0.6.12 (latest is 1.0.2)
  ├── jquery#2.1.0 (2.1.1 available)
  ├── jquery-placeholder#2.0.7 (2.0.8 available)
  ├─┬ jquery.cookie#1.4.0 (1.4.1 available)
  │ └── jquery#2.1.0 (2.1.1 available)
  └── modernizr#2.7.2 (2.8.2 available)
```

Providing a bower.json file fixes this:

```
>>> bower list
bower check-new     Checking for new versions of the project dependencies..
JointsWP C:\xampp\htdocs\wordpress\wp-content\themes\JointsWP
└─┬ foundation#5.2.1 (5.2.2 available)
  ├── fastclick#0.6.12 (latest is 1.0.2)
  ├── jquery#2.1.0 (2.1.1 available)
  ├── jquery-placeholder#2.0.7 (2.0.8 available)
  ├─┬ jquery.cookie#1.4.0 (1.4.1 available)
  │ └── jquery#2.1.0 (2.1.1 available)
  └── modernizr#2.7.2 (2.8.2 available)
```

It's now easy to update all dependencies using `bower update`. This pull request resolves #34.