Add requirements
Start adding the tests I should already have written
Move tests to their own package
Test directory inclusion
Test adding new directory, make sure zip file test is on a non-empty file
Expand ZipBackup docstring
Add more tests to be implemented
Less confusing variable name
Clarify python versions
Finish ZipBackup tests

Less wordy test docstrings, rename test files to prevent name clashes
Fix error in readme
Test the BackupIncludedDirectory class