Code Refactor

[nskins]

Complete refactor of the codebase.

• Increases line coverage of test suite to 100%.
• Increases documentation coverage to 100%.
• Provides CONTRIBUTING.md for helpful contributing tips.
• Simplifies code while maintaining readability.

[coveralls]

Changes Unknown when pulling 435c777ed832d05aa0c384897732764e27bffb1a on refactor into on master.