Fix: spell mistake
Merge pull request #55 from bufferx/bugfix-spell-mistake

Fix: spell mistake
Normalizing whitespace
Implementing SCAN, SSCAN, HSCAN, and ZSCAN

- refactoring reply_zset to stay DRY but fit my needs
- adding reply_map for easy handling of compound results
- adding unit tests
Fixing *SCAN tests for python 2.6 and 3.3