First 2 Entropy functions

1. Changed makefile, running `make` does testing without logging, running `make test` does verbose testing.

2. Removed DRNGSeed from Block, placed it in State

3. Removed tests in block_test.go, because strings got changed to []bytes, I intend to add these tests back in later.

4. Renamed Stage1Entropy and Stage2Entropy to EntropyStage1 and EntropyStage2

5. Added 2 entropy functions, 1 more planned (to generate and merge entropy)

6. Added tests for both new entropy functions