add custom info in demo
Merge branch 'master' of github.com:marginelson/jSprite

* 'master' of github.com:marginelson/jSprite:
  only sprite.position is enough to calculate position
  not the time for method prev, yet
  separating goto for horizontal and vertical sprites, check for last frame, preventing double start
  unnecessary check every time
  method goTo, closes #14
improvements
normalize grunt
attrs in grunt copy
Merge branch 'master' of github.com:marginelson/jSprite

* 'master' of github.com:marginelson/jSprite:
  documenting changes
task uglify