Added default gitignore file
Added connectivity problem solution with tests
Added color image application
Target 64 bit platforms.

We can run the program on networks of size N=100000000
Added "End" and default to the WeightedQuickUnionPathCompression algorithm
Fixed two serious implementation mistakes

Size must be initialized with all ones. We must compare the sizes of the
trees starting at the roots and not at the elements p and q.
Removed packages
Presentation
Reduced memory footprint.

Keep track of height instead of size for the
WeightedQuickUnionPathCompression  algorithm.. This save 3 * N bytes of
memory.
Significant performance improvement using Parallel.For