Update dependency definition

Update `grunt-lib-contrib` dependency definition as described in docmentation [GitHub](https://npmjs.org/doc/json.html#dependencies).

Setup of `node v0.8.19` and  `npm 1.2.10` throws error

```
npm ERR! Error: No compatible version found: grunt-lib-contrib@'>=0.3.0- <0.4.0- >=0.4.0- <0.5.0-'
npm ERR! Valid install targets:
npm ERR! ["0.3.0","0.3.1","0.4.0","0.5.1","0.5.2"]
```