changed version to reflect setup.py update

unpdated relative paths in tests folder

reflect changes in setup.py

Merge pull request #40 from bexxmodd/tree-feature

Tree feature

Merge pull request #39 from bexxmodd/tree-feature

corrected module imports from relative to absolute to resolve conflicts

added viztree ready for release

tagged new release

v1.5.1 release ready

Merge pull request #10 from bexxmodd/master_refactor

Master refactor

setup.py updated to a new version