Disabling progress as it is causing issues with STP stuff.

The vtkPVProgressHandler is calling vtkMultiProcessController::GetGlobalController()
at rather arbitrary times and is not getting a consistent global
controller with the vtkMultiBlockSpatioTemporalStatistics filter
as that filter plays around with the global controller. This is
causing memory access issues so I'm disabling progress.
Merge pull request #24 from aashish24/disable_progress

Disabling progress as it is causing issues with STP stuff.