Moving Kite Dataset API info from old guide per CDK-753.

Link to the old guide from which this came. This is just shards of information brought forward so they're not lost. This info should be woven into the samples before 1.0.

http://kitesdk.org/docs/current/kite-data/guide.html
I think the boolean is actually whether any action was taken. If the dataset doesn't exist already, then it will be false. Otherwise, it will be true. The method is always successful, unless exceptions are thrown.