cairo: libpng is non optional
ZopeInterface: version bump
Twisted: version bump
tornado: version bump
ipython: major version bump

Remove MathJax installation again. It's supposed to be installed
by the user (nonsense... -.-)
lightdm: Version bump 1.10.0
hugin: version bumped

correct dependencies
lensfun: fix download & minor version bump
pydot: fix data installation
dillo: version bump
Merge pull request #304 from v4hn/dillo

dillo: version bump
Merge pull request #303 from v4hn/lensfun

lensfun: fix download & minor version bump
Merge pull request #299 from v4hn/hugin

hugin: version bumped
httpd: version bump to 2.2.27

The Apache guys seem to have picked up the obnoxious habit of
removing older versions of httpd from their distribution page,
so this module is actually broken now with the old version there.
ruby: version bumped to 2.1.1.

Last version released.
awesome: version bumped to 3.5.5.
vala: version bumped to 0.24.0.
gtk+-2: version bumped to 2.24.23.
mpd: version bumped to 0.18.10.
lxc: add the systemd service file.