ENH: Better coverage of various sections
FIX: Fix app test
ENH: Add basic tests for scene
FIX: Better test coverage
FIX: Fix normal calculation
ENH: Cleaner and faster normal calculation
FIX: Fix coveragerc, entity test
FIX: Fix spacing
FIX: Fix typos
FIX: remove debug comment
FIX: Fix skips and typo
STY: flake8 fixes
Merge pull request #81 from Eric89GXL/better-coverage

ENH/FIX: Better coverage