chore: remove pyc files from repo
fix(packaging): clean up setup.py and add templates in MANIFEST.in

also: bump version to next release
fix(packaging): use setuptools for easier data/package inclusion

also:
add packaging internals to .gitignore
use relative import in liststyle/__init__ package
refactor(admin): remove unused import
feat(admin): add grappelli's change_list_result for ease of use

Template taken from django-grappelli==2.5.1, also updated README note