===GSOC teaser tasks===
====update Contacts last seen for muc messages as well===
The contact class (entities/Contact) has the ability to save the last time that Conversations
  received a message from that contact. Currently this time only gets updated for one-on-one
  messages. In non-anonymous mucs messages from a contact should also update the last seen
  time.
====Select multiple Contact in Choose Contact Activity====
Currently the choose Contact activity allows only for one contact to be selected. A long
press on one contact should bring the activity in a mode where the user can select multiple
contacts.
The Activity should then return an array of contacts instead of just one
====Request and respond to message receipts in MUC PNs====
Private MUC messages either dont request message receipts or dont respond to them. The source
of error should be determined and eliminated. A rather small tasks that just teaches you a bit
about the stanza parser and generator in Conversations