[SimlarService] making sure we have a simlarId for CallingActivity when starting it from ContactList

  * This is part of issue #91.
[SimlarService] terminateCall triggers terminate if there is no ongoing call

  * This is part of issue #91.
[SimlarService] now uses only one icon in the notification bar

  * This is part of issue #91.
[SimlarCallState] added call status display message "connecting to server" and "connecting to server timed out"

  * This is part of issue #91.
[SimlarService] notification text is now based on LinphoneCallState

  * This is part of issue #91.
Merge pull request #110 from simlar/push-notification3-pullrequest

Push Notification Pullrequest 3