Fixes Bundler instructions.
my redis version returns true/false, not 1
changes #lock to return the value of the block instead of the lock
adds travis-ci to test against version 2 and 3 of the redis gem
adds travis badge
fixes name of redis package
Merge pull request #1 from langalex/master

Fixes Bundler instructions, supports Redis 2.6, changes #lock return value.