changed SocketRemote address property to host

SocketAppenderBase uses 'remoteHost'.  The 'remote' suffix seems a
little redundant when configuring the property inside of a <remote>
component, so the preferred name is 'host' in SocketRemote.  However,
for consistency with SocketAppenderBase, this property can also be set
using 'remoteHost'.
Merge pull request #102 from ceharris/socketRemoteHostProperty

changed SocketRemote address property to host