[CreateAccountActivity] now starts service only for test registrations and stops it afterwards

  * This is part of issue #91.
[SimlarService] removed KeepAwakeReceiver (Dennis, Ben)

  * This is part of issue #91.
[SimlarService] added terminate checker

  * This is part of issue #91.
[SimlarService] turns on display when finishing a call

  * This is part of issue #91.
[SimlarService] now allows to set simlarId to be called on startup

  * This is part of issue #91.
[CallActivity] now may start the SimlarService and trigger calls

VERY WIP [CallActivity] now starts the call

  * This is part of issue #91.
[CallActivity] does not finish anymore when SimlarService finishes

  * This is part of issue #91.
[CallActivity] fixed crash if service is not available

  * This is part of issue #91.