[SimlarService] make sure to connect to server after LinphoneThread is intialized

  * This is part of issue #91.
[SimlarService] fixed starting service when its going down already

  * This is part of issue #91.
[SimlarService] make sure we remove the notification when terminating

  * This is part of issue #91.
[SimlarService] when going down ignore new calls

  * This is part of issue #91.
[SimlarService] removed Toast when terminating

  * This is part of issue #91.
[MainActivity] removed menu entry for quitting app

  * This is part of issue #91.
[LinphoneThread] fixed race condition

  * This is part of issue #91.
[LinphoneThread] improved destroying linphone thread
[LinphoneThread] Code Cleanup: added some finals
Merge pull request #111 from simlar/push-notification4-pullrequest

Push Notification Part 4 Pullrequest