Removing backup files, add .gitignore and .gitattributes
Lint, PEP 8 checks

Tabs to 4 space indentation,  unchained imports, Blender-only import
last, line length, spaces around operators, end of file line, proper
comparison for True
Merge pull request #1 from le717/master

Remove backup files, .gitignore and .gitattributes, Lint, PEP 8 checks