Rename desktop file to use our reverse-dns name

This will probably be needed in the future.
Remove last occurrences of corebird.desktop
add hometimeline test case
potiles.skip: Add org.baedert.corebird.desktop.in
itests/Makefile.am: Typo
tests/gitignore: add hometimeline
Make DefaultTimeline/HomeTimeline public
tests/gitignore: Ignore *.stamp-t
tests/hometimeline: Try to test more