Change formatting to gofmt
Replace CreateStmt with OnExprList

OnExprList can be unmarshalled into ast.Expression without having to parse
Add NodeInfo struct as per the protocol
Index manager changes for Notify and Nodes

Add CloseNotify to close connection if client connection is gone
Send Latest ServerUuid in Notify message
Changed Indexinfo -> Index as per protocol
Use NodeInfo in handleNodes
Index client changes for Notify

Change notify to parse server response and return ServerUuid, notification type
Reuse single http client
Add logging
Updated unit tests with latest changes

Mostly related to Notify, Nodes and OnExprList