change version
adjust exception logging on bluetooth connection
change version to release
Merge branch 'bugfix-0.9.1' into develop
allow adjustment of sampling rate via preferences
remove serialization of service state
some verbose logging on lifecycle methods.
improve memory usage on db storage of measurements
reduce memory usage: do not hold measurements in an ArrayList
check for existing properties on MAF calculation
refactoring: do not use a reference to a Track object in CommandListener
first prototype "track as reference"; fix issues with tests
fix UI Activity test (IllegalStateException regarding Theme/Sherlock)
shutdown commandlistener before init.

might exist multiple times - depending on race conditions.
Merge pull request #234 from matthesrieke/feature-track-as-reference

Feature track as reference