Zen 2.0 release

Zen is now completed! There may be some bug fixes or optimizations if needed but other than that the game is complete. 

The major changes are listed below:

Rather than each set of levels being part of their own little zen garden now each set is one section of one large garden.

Added a new set, Masters of Haiku

Added in a How to Play set.

Added sound effects for walking between levels and for the letter wheels

Added several calm music tracks to replace the nature sounds.

Changed the look of the lines to make it more interesting and a bit easier to see.

Improved performance a bit.