Update the 'ship it' linkage

The current **ship it** link goes to a [bad Skitch URL](http://img.skitch.com/20100310-nrgxbwqm58tibiq2un6mujqmm5.png) that throws this error:

```xml
<?xml version="1.0" encoding="UTF-8"?>
<Error>
  <Code>AccessDenied</Code>
  <Message>Access Denied</Message>
  <RequestId>D502D04B70BEF70F</RequestId>
  <HostId>puzF5nsVMvzXyvT54losZ2C21rS7BS8axhd8P9qWfty2852nUzrZ9fSa4h/Z63te</HostId>
</Error>

``` 

How about changing it to point to http://shipitsquirrel.github.com instead?

Cheers,
  Lee :beers: