Merge pull request #90 from johnheroy/master

Test for particle acceleration (gravity)
Disable SVG pointer events to stop stealing focus from game
Pass loginform info to SimpleGame to allow joining correct game on Firebase
Merge pull request #94 from concreted/join-games

Pass loginform info to SimpleGame to allow joining correct game on Firebase
Merge pull request #92 from concreted/focus

Disable SVG pointer events to stop stealing focus from game
Added npm-debug.log to .gitignore, resolves #102