Remove cloudfront URL's.

I've consistently found that using CloudFront on top of the raw S3 bucket
has *worse* performance than just downloading from S3 directly. This might
be because we tend to hit cold CloudFront caches since there are not
e.g. thousands of downloads of this per day. I've elected to revert
using CloudFront for now and we can switch it back on if we want
it.
Update for fully packaged Shark 0.8.0 and 0.8.1.

Previously the Shark 0.8.0 package was based on a SNAPSHOT
release and not using the finalized Shark packaging format.

There was a minor packaging change in that Hive is no longer
included in the binary Shark releases. So that is downloaded
seperately. Some care is taken to make sure that it still
works with older versions of Shark.
Bug fixes

Conflicts:
	spark/init.sh