Add mp3 volume function
"setiOSAudioStreamVolume"
Apply Xcode ARC and Modern Obj-C refactors to IOS project
Fixed logic in Deathball's updateRollAnimation.
Merge pull request #19 from eightyeight/deathball-update-roll-animation

Fixed logic in Deathball's updateRollAnimation
Merge pull request #14 from pchan126/feature/mp3Volume

Add mp3 volume function
Merge pull request #17 from pchan126/feature/iOS_ARC_refactor

Apply Xcode ARC and Modern Obj-C refactors to IOS project
- Added new ShapeVectorToy to showcase the basic ShapeVector object
- Fixed radius calculation when resizing circular ShapeVector objects