Merge pull request #37 from tyane/fsharp

euler 15
Updated formatting to make the sol'n easier to read.  Also changed Int64 to Int16 (Int64 isn't necessary here as we're dealing w/ individual ints < 10)
Didn't end up needing System after all
Removed dependency on System.Numerics
Adding Tyler to contributors list
Merge branch 'master' into fsharp