Add tests

Update .gitignore

Update README

Add tests for Miyuki::Tracker

Fix Miyuki#refresh_torrents

Delete watchDir after every scenario has been runned

Use safe watchDir deletion

Implement tests (WIP)

Implement tests (WIP)

Implement tests (WIP)

Merge branch 'file-watcher' into tests

Add tests for file-watcher

Remove TODO line

Update README

Add .travis