Update STHbench-Dev012.11.sh

Took about 16 minutes off of the 18min 43s runtime of the sysbench test by modifying values.
Update STHbench-Dev012.11.sh

Redis benchmark from 18 min to 3 min in this version.
Update STHbench-Dev012.11.sh

Made redis a bit faster. In line with some other benchmarks I have seen.
Cleaned up code, moved changelog and todo out
Merge pull request #26 from chuckleb/cleancode

Cleaned up code, moved changelog and todo out