Added missing icns file. Image was taken from http://www.gabencoin.org/
Added some checkpoint blocks for the first 12k transactions. Checkpoint
blocks are necessary to prevent someone controlling 51% of the computing
power to rewrite history. Rewriting history is possible but they can
only go back as far as the latest checkpoint.
Merge pull request #1 from kovertopz/master

Added missing icns file. Image was taken from http://www.gabencoin.org/