Add simple historical results using file store
go fmt
Use old version of cmdtest required by cf-acceptance-tests
Add historical date ranges, dummy out push

Only added to the HTTP interface. Considering if there's an easy way
to have both the cmd line and the web interface driven from a simple
common object rather than duplicating stuff.

Initially mocking out the actual push for now so the system tests run
more quickly. Would like to do this properly but think it's easier to
wait until we have yaml file scenario support and just use that.
Add flag to run in server model
add / to experiments url
Initial support for concurrent/serial load

Only via command line, but with a nice animated terminal UI.
wip - progress bar
fix tests
fix system tests, need a better way of testing without hardcoding expected time
fix tests
fix concurrency bug in test
Merge pull request #1 from julz/historical-results

Add simple historical results using file store