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

....

**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.
need to test that this actually works somehow. (talked verbally with Matthew and decided we're also going to add a 'getCallLog' to verify)