v1.1.0 compatible with ES 1.1.0 / security fix

fixed security problem in ip authentication.

security problem introduced in commit 53d1cf8

changes:

• remove usage of 'Host' header to identify client's ip
• the request ip is used to ip authenticate direct connected clients
• add usage of trusted proxy chain
• the trusted proxy chain is used to ip authenticate indirect connected clients
• added unit and integration tests
• updated log messages