Merge pull request #489 from xetorthio/scan_commands

add SCAN, HSCAN, SSCAN and ZSCAN
make pubsub test fast
make control command tests fast
make list command tests fast
make object command tests fast
make list command tests even faster
speed up JedisSentinelTest
make JedisTest fast
make JedisSentinelPool fast
Merge pull request #490 from xetorthio/speedup_tests

Speedup tests
add WAIT command
Add null check before encoding