Use Ubuntu 14.04 for CI builds
Use Ubuntu 14.04 for CI builds

Ubuntu 12.04's libgphoto2 package is too old.

Also, since libraries are not installed with an unversioned name,
they're simply symlinked to one. See
<https://github.com/ffi/ffi/wiki/Loading-Libraries#linux-packages>
for details.

zaeleus/ffi-gphoto2