Added a feature that allows testers to add records to call log in device...

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**This feature requires the application under test have the WRITE_CALL_LOG**
permission. Adds a method within ServerInstrumentation addPhoneLog that takes a String parameter for the phone number and int parameter for the call duration.  Sets up end points and flow to call this method from SelendroidDriver.
signature should just List<CallLogEntry>

Your CallLogWrapper could / should get renamed to something like CallLogUtil  and have static methods that take in list of call log entries.