Travis-CI: build Debian packages
Debian: removed obsolete build_jabber-net_with_default_compiler patch
Debian: refreshed quilt patches
Travis-CI: install gtk-sharp2-gapi and libgtkspell-dev as needed as build-dep
Travis-CI: rename and extract tarball and move to the right location for dpkg-buildpackage
Debian: use ./autogen.sh only if available
Merge branch 'stable'

Conflicts:
	.travis.yml
	debian/patches/build_db4o_with_default_compiler.patch