Mechaml 1.0.0

Changes

• breaking change to the API : separate the agent data and server's response in the Agent module
• add a Agent.Monad module that combines state (agent) and promises (Lwt) and associated helpers
• add wrappers and support for Lambdasoup lazy traversal of HTML documents
• handle default value and hidden inputs in forms
• handle multiple select lists
• remove code of unspported features (file upload, proxy, ...)
• improve tests and documentation
• switch to 3-digits versionning