Merge pull request #1 from maxim123/master

Added bugs, improvements and additional checks
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Merge pull request #2 from stevemer/patch-1

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Refactored Code
refactored code
refactored code
Update style_grader_classes.py to include docstrings and use new-style class inheritance
Remove "import *" usage (maintenance)
Use python env in main (make executable)
Rename one or two functions to follow convention
Allow ".h" extensions (1 line)