Removed useless check for deltaX on trail rendering
Added checks for trail rendering to avoid artifacts on "respawn"
Improved background drawing
Placed runner on ground at start and improved first block.
Added array of footstep sound samples which is shuffled after each iteration
Separated runner trail implementation
Fixed a signed / unsigned warning
Improved runner trail implementation to use a gradient texture
Added missing resources
Merge branch 'master' of github.com:alexpana/dont-stop-running