added skeletons for the crypto fuctions
Update Makefile, address github PR comments

'make' now no longer runs 'make test', 'make test' is no longer
automatically verbose, and 'make test-verbose' is verbose. Renamed
'Entropy()' to 'EntropyBytes' (still debating that name though), renamed
'MergeEntropy()' to 'DRNGSeed' and made some general performance
enhancements, and improved the syntax and readability of the code.