TCX Output Tuning

- Interpret cadence only as biking cadence when activity was marked as biking.
- Otherwise encode as RunCadence in the Extensions

MyTracks/libs/README.txt

@@ -0,0 +1,14 @@
+The libraries contained here in binary format are licensed according to their
+own licenses, which allow their usage for the My Tracks application. Any other
+applications that wish to use these files should consult the appropriate
+licenses or the JAR's authors.
+
+References are provided to the libraries:
+
+google-api-client-*.jar (GData client):
+http://code.google.com/p/google-api-java-client/
+
+google-common.jar,
+googleloginclient-helper.jar,
+libmymaps.jar (Google My Maps upload library):
+Licensed exclusively for use in My Tracks and derived Android applications.