0.4.1

• Added client-side leader election
• Added stats endpoints
• Added logging
• Better exception handling
• Check for cluster ID on each request
• Added etcd.Client.members and fixed etcd.Client.leader
• Removed locking and election etcd support
• Allow the use of etcd proxies with reconnections
• Implement pop: Remove key from etc and return the corresponding value.
• Eternal watcher can be now recursive
• Fix etcd.Client machines
• Do not send parameters with None value to etcd
• Support ttl=0 in write.
• Moved pyOpenSSL into test requirements.
• Always set certificate information so redirects from http to https work.