Improve compliance with official Python code styles

[desilinguist]

• Use pydocstyle to improve compliance with PEP 257 for docstring conventions.
• Re-order imports to improve compliance with the PEP-8 section on ordering imports.

Both of these can be done fairly easily using Sublime Text:

1. Install SublimeLinter and then the pydocstyle plugin for SublimeLinter. Then fix any issues identified.
2. Install the isort for Sublime and it auto-sorts the imports for you on any file.

[desilinguist]

This will be completed once we finish #647 since import sorting is already in place.

[desilinguist]

Completed along with #647.