Google Compute image:

Removed the 'wait for GCE metadata service' job, as it was causing
issues with the metadata service (likely some firewall or something).
In stead, use wget with retries (including connection refused) in
stead or curl for fetching the SSH keys. Also made the stdout/-err
of this job appear in the console.
Add a bunch of Hydra dependencies to the channel
freecad: updating to 0.14

I had to update all the pyside programs, or freecad failed to build.  I picked
the versions advertised in http://qt-project.org/wiki/PySideDownloads . The
rest I took for github latest releases.
Update mumble to 1.2.7.

(Chery picked from release-14.04)
Remove broken flag for xen, build with gcc45.
nano: support system-wide nanorc

This patch does two things
1. builds nano with sysconfdir=/etc; and
2. adds an option programs.nano.nanorc
nano: bump to version 2.3.6