Add the search bar on the top of the smartlist and the list of found
results.

Add an other list for search results. This list is splited in 2
sections for filered and found results.

Add "No Conversations" label if there is no conversations

If the contact is not found locally, a new conversation is created

Change-Id: I7985f0644f97063875bfb02159d44dd1aa8b731e