Python 3 compatibility:

- Use unicode literals; Use basestring for sql indexing
- Use print function
PEP 8: Refactor functions, arguments, and variables
PEP 8: Optimize imports
PEP 257: Add missing docstrings
PEP 343: Convert file access to with open() style
Use EnvironmentError instead of (IOError, OSError)
Standardize string formatting
Remove unnecessary typecasting
Remove arguments equal to default parameter
Update help message to use docstring and unix style (e.g. grep)
Lint 9.96/10 and fix spelling/grammar