Fix syntax error in bower.json

Fix for this issue

bower install git://github.com/viljamis/responsive-nav.js.git
bower cloning git://github.com/viljamis/responsive-nav.js.git
bower fetching responsive-nav.js
bower cached git://github.com/viljamis/responsive-nav.js.git
bower checking out responsive-nav.js#1.0.14
bower error Failed to parse json
Unexpected token ]

There were errors, here's a summary of them:
- responsive-nav.js Failed to parse json
Unexpected token ]
An error was caught when reading the bower.json: Failed to parse json
Unexpected token ]