Fix project dependencies.

- MyTrack app should export google-common.jar, common-logging-1.1.1.jar,
  protobuf-java-2.3.0-lite.jar and the MyTracksLib library.
- A test should only depend on its app. E.g., it should not need to
  reference the MyTracksLib library again.

SignalStrengthSamplerTest/project.properties

@@ -9,4 +9,3 @@
 
 # Project target.
 target=android-14
-android.library.reference.1=../MyTracksLib