Allow for custom testcases with the `leetcode test` command, and some minor edits#7

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clearloop merged 3 commits intoclearloop:masterfrom

Raees678:master

Feb 29, 2020

Commits on Feb 28, 2020

Adds gitignore for .DS_Store junk file, fixes description of test command
Raees678
committed

Commits on Feb 29, 2020

Adds support for custom testcases with leetcode test command, updates gitignore to ignore macOS .DS_Store and IDE .idea files
Raees678
committed
Resolves ambiguity in test case displayed, replaces , with ↩ character
Raees678
committed