Added function to load trajectory from csv file
Added one environment (Sridhars tunnel) and one trajectory to test overlaying
Added tables in requirement (anticipation for hdf file)

A command line can be used to create grid based database

So that grid and trajectory rendering can be performed seemlessly
The test fucntion does not run yet

This feature will be useful for easy trajectory rendering

add tox and flake 8 in install

Require ipython

A console script has been added, blendunittest,  to run unittest under blender.
The blender unittesting file should start by blendtest, and be formatted according to unittesting convention.