Upgraded Grunt to 0.4

[wibblymat]

Started working on the code again and working with Grunt 0.3 was making me feel icky.

Highlights:

• I wasn't in the package.json list of maintainers, so I fixed that 😄
• The jshint options for Grunt were different to the ones in the .jshintrc. Unified them all and made Grunt load them from the .jshintrc
• Added testing on node 0.10 to the Travis config
• Source maps!
• Changed the default Grunt task to be just 'test' rather than the old default of 'generate the release files without testing anything' (?!)

[sindresorhus]

both needs to be quoted

[sindresorhus]

Thanks Matt and great to hear your touching the code again. Me and Addy just talked today about wanting to get this thing rolling again :)

[addyosmani]

👍 Once again, thank you so much for taking the time out to work a little more on this project. It means a great deal to us :)