Add float increment commands and fix RedisReply range interface.
Add serializeToJsonString.
Change the Redis type wrappers to use statically typed values and add some missing operations.
Add some more recent Redis functionality and fix test.
Add the first draft of a Redis idioms module.
Fix compilation error for DMD master. Fixes #765.
Fix RangeCounter for inserting single 'char' values.

Also add unit tests and assertions to catch related bugs.
Improve various opApply and opSlice signatures + add RedisSet.getAll().
Minor reformatting