Setting up for overhaul.

Setup for data file testing as well.

Update test_layer_ZonalOperations.py

Added a zone layer (dataz) for zonal statistics testing.

Utility local executors to solve new spatial problems.

Update INSTALL

Update README.md

Minor tweaks.

Fixed optional scipy import for Zonal Majority/Minority operations.

Update README.md

Fixed library requirement bug to make them optional.

Cleaned up utility codes. Now pep8 compliant.

Cleaned up core code. Files now pass pep8 except line length.

Added new Focal operations

Test procedure added.