Fix for #55
Hold the mutex in lock_path_exists?
Merge pull request #57 from tsilen/issue-55

fix for #55

I was able to get to a situation where the lock znode was gone, but we didn't get a session expired error or similar. This results when we already have a @lock_path, but when next_lowest_node actually fetches the list it isn't there.
Update README.markdown

Fix typo. 
Merge pull request #58 from wjossey/patch-1

Update README.markdown
bump zookeeper dependency