get rid of autotools
Instead of devtools, buildtools are enough now.
remove doc subpackage, as leaf package do no need to have generated doc
Merge remote-tracking branch 'origin/master' into rid_autotools
adapt travis config
Merge branch 'master' into rid_autotools

Conflicts:
	.travis.yml
Travis: s/devtools/buildtools/; s/rake.gem/rake.deb/
Really use devtools in Travis.

Otherwise this fails:
$ rake check:pot
/usr/bin/y2tool y2makepot
y2tool: Can't find "y2makepot" in /usr/share/YaST2/data/devtools/bin

This partially reverts commit 2fa24fd9f693cfa28b0f4231c1d0697a90185f66.
Merge pull request #23 from yast/rid_autotools

get rid of autotools