Merge pull request #192 from DavidVorick/join

Join
make NewBalance take just 1 uint64
use loops in Makefile
remove MessageRouter interface
add BenchmarkMerkleCollapse
add more siaencoding tests
Merge pull request #193 from DavidVorick/join

Add Full Quorum Tests
finally remove global scriptEnv
fixed snapshot failure issue
Merge pull request #194 from lukechampine/reorg

Remove global script execution environment
fix multi-join, debugging statments not removed
merge Luke's changes