Adding date to readme text
Adding top and bottom nodes to Percolation
Tightening up documentation of constructor, adding utility functions.
Removing some of the less useful comments, adding calls to unionSites method.
Added TERRIBLE Union algorithm and equally bad percolates algorithm.
Reworking class documentation to be more accurate.
Adding PercolationStats
Adding newline to PercolationStats so git doesn't yell at me.
Adding methods to PercolateStats.java. Lots to do.
Throwing an exception to inform users that the provided areguments are invalid.