Fix for broken HipChatAdapter.Reply method

Honestly not sure how or IF this even worked before, but I've fixed it.
Apparently you need the fully qualified user@host to be passed into the
Jid constructor
Moved string Concatenation outside loop

Moved string Concatenation outside loop in HipChatAdapter.Reply to
reduce overhead.
Merge pull request #117 from jamesbascle/master

Fix for Broken HipChatAdapter.Reply method