Added unit testing with py.test

.gitignore

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+*.pyc
+__pycache__
+/*.egg-info/
+/.cache
+/.coverage

requirements-dev.txt

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+# Primary requirements
+-e .
+pytest==3.4.1
+pytest-cov==2.5.1
+
+
+# Secondary requirements
+attrs==17.4.0
+coverage==4.5.1
+pluggy==0.6.0
+py==1.5.2
+six==1.11.0

setup.cfg

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+[tool:pytest]
+addopts = -v --cov blender_asset_tracer --cov-report term-missing
+
+[pep8]
+max-line-length = 100