redis.client.Lock: use float timestamp
Changed the way commands are packed to increase performance
work with new pip/tox
handle ResponseErrors when parsing MULTI in pipelines.

fixes #375
changelog
call socket.shutdown() before socket.close()
Merge branch 'lock_timeout' of git://github.com/vitek/redis-py into vitek-lock_timeout
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version bump to 2.8.0
typo
Make the pack_command optimization compatible across python versions
Merge branch 'master' of git://github.com/gviot/redis-py into gviot-master
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Checking if pipeline is empty prior to executing per discussion in #362
returning empty list when empty pipeline run per discussion in #362
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Merge remote-tracking branch 'redis-py/master'
fix zrevrange parameter name where there is a semantic error.
check : http://www.redis.io/commands/zrevrange