elixir 0.12.4 & readme note about libcouchbase
Now points to chitika/cberl, fixed doc typo, added open/3
added open/5: name, workers, host, bucket, pass
added .DS_Store to .gitignore
Merge pull request #10 from MCRedJay/master

Update for 0.12.4 elixir, added open/5, other fixes.