Data Generation Functions

[davidkohn88]

It would be great to have some simple data generation functions for creating demo/test data for playing around with use cases. I'm not sure what exactly the parameters to this sort of function should be, but probably it would generate a random timeseries, with a step size for the timestamp and then a value that either followed a random walk, with bounds, or had data with a given distribution around a center or something like that, possibly a sinusoidal variation on small scale to simulate noise etc.

I think this would be very useful for
a) demonstrating the other functions and showing users how to use them
b) letting users generate their own test data sets for themselves

(Coupling this with UDAs would actually simulate inserts on a relatively frequent basis...interestingly enough).

[JLockerman]

@mfreed also has a request for a better generate_series() which might be related.