made everything parameterized
forgot to add xMean as an option. Also refactored a bit where the default options are computed, and have startDrawing return this.
added configurator class
can customize size of particles now
renamed start configuring to startconfiguringposition and changed test image size
fix: ok particle sizes are actually configurable now
can configure sparkle size now. Also refactored to pass in configure type instead of separate functions becuz i'm lazy. also started stubs for configuring num sparkles.
can configure the number of sparkles
Merge branch 'master' of github.com:lorenyu/image-particle-effects