Add Garmin Edge 810
INSTALL-MAC libusb instructions

Now include the patch required to get a compilation
going. Thanks to Gareth for the link.
Merge branch 'master' of github.com:/GoldenCheetah/GoldenCheetah
Remove german translations for weekly summary
Merge branch 'master' of git://github.com/GoldenCheetah/GoldenCheetah into upstream_master
Merge branch 'upstream_master'