Update license terms
Prevent cache tag data from being lost in race conditions. Refs #33
Track latest lib/Credis (fixes possible infinite loop due to fwrite bug).
Allow keys to be set without expire times. Refs #33
README improvements: formatting and usage notes.
Merge pull request #42 from copious/master

README improvements: formatting and usage notes
Update README to fix prevention of running garbage collection script when register_argc_argv is On. Thanks, David Alger!
Fix PHP notice when port is not specified.