welcome video starts from the beginning now
sound now stops after closing welcome video
profile page no longer shows NaN% for Arena and Constructed play

i moved the number_to_percentage call into the Arena and Constructed
classes so that it either returns "N/A" if the user has no games
played, or a percentage if they did.
skip added back into video
fix hound issues
fix hound empty line issue
Merge pull request #397 from dlcoffee/new-user-fixes

New user fixes
Merge pull request #400 from HearthStats/staging

Staging