yield instead of block.call
Style improvements and key checking simplification
Further style improvements
Merge pull request #2091 from arcz/master

Style improvements and unification
Refactor redis usage to avoid nil result from multi, see redis/redis-rb#490
Merge pull request #1995 from seuros/yield

yield instead of block.call
Loosen up dat timing
Merge pull request #2094 from mperham/fix_nil_multi

Refactor redis usage to avoid nil result from multi, see redis/redis-rb#490