Split big test file into files with 1 test class.
Re-add init file to avoid test package error.
Fix comparison bug in test.

Ungilded comments have value 0 for gilded. Gilded have > 0
Simplify loops in test with first and all
Flatten and remove usage of unittest
Move getting normal testing subreddit into helper
Fix bug in image_test

The final assert creates a list of booleans. They intended to
test whether a file had been uploaded, but didn't since.
assert [False, False, False] doesn't raise an error.