Add utility for pipelining within 'with' statement.
changelog
fix zrevrange parameter name where there is a semantic error.
check : http://www.redis.io/commands/zrevrange
Merge pull request #379 from xiaost-bytedance/redis-py-fix

fix zrevrange parameter name where there is a semantic error.
Improved sentinel commands support
Add redis.sentinel module
Add docstrings for Sentinel class
README.rst: add Sentinel support section
Rework slave selection logic
Allow to specify user's own connection pool class
SentinelConnectionPool: add check_connection flag
PEP8 fix
Add tests for sentinel module
Errors during auth or DB select now close the socket

Fixes #368
Merge branch 'master' of github.com:andymccurdy/redis-py
comments and changelog
Merge branch 'vitek-sentinel'

Conflicts:
	CHANGES
Make docstring for hmset less ambiguous
Merge pull request #383 from eode/master

Make docstring for hmset less ambiguous
Lock.release(): reorder code so assignment to
self.acquired_until is protected by the lock.