Single task to run all tests and linter

[ScottyB]

Currently we have to run four different commands to make sure CI does not break. These tasks should be consolidated into a single command that can be run. The tasks currently required are as follows:

• python3 setup.py test
• find surround/ -iname "*.py" | xargs pylint
• find examples/ -iname "*.py" | xargs pylint
• ls examples/ | xargs -n 1 -I '{}' python examples/'{}'/main.py