refactor storage to a separate class
Merge pull request #26 from kshchepanovskyi/master

#23: Fix NPE when renaming a set
Merge branch 'master' into refactor_storage

Conflicts:
	src/main/java/com/fiftyonred/mock_jedis/MockPipeline.java
Merge pull request #22 from 50onRed/refactor_storage

refactor storage to a separate class
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