Removed comma to fix JSON parse error.

npm chokes on the comma and prevents npm from installing:

```
(master) ~/Sites/grunt-starter $ npm install
npm ERR! install Couldn't read dependencies
npm ERR! Failed to parse json
npm ERR! Unexpected token }
npm ERR! File: /Users/zachharkey/Sites/grunt-starter/package.json
npm ERR! Failed to parse package.json data.
npm ERR! package.json must be actual JSON, not just JavaScript.
npm ERR!
npm ERR! This is not a bug in npm.
npm ERR! Tell the package author to fix their package.json file. JSON.parse

npm ERR! System Darwin 11.4.2
npm ERR! command "/usr/local/Cellar/node/0.10.7/bin/node" "/usr/local/bin/npm" "install"
npm ERR! cwd /Users/zachharkey/Sites/grunt-starter
npm ERR! node -v v0.10.7
npm ERR! npm -v 1.2.21
npm ERR! file /Users/zachharkey/Sites/grunt-starter/package.json
npm ERR! code EJSONPARSE
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     /Users/zachharkey/Sites/grunt-starter/npm-debug.log
npm ERR! not ok code 0
```