1) Make the demos work again.
2) First step in restructuring the demos into a single repository
Remove the rand demo directory
Move all the code for examples under the examples directory.  Also add initial take on flights demo.
1) Adjust the example code to all be in one repository.
2) Adjust the run scripts to be able to switch between different examples.
Merge branch 'master' of https://github.com/metamx/druid