Make the bootstrap go faster

[crawley]

It seems that most of the time doing the chef / berkshelf boostrap foes in building the native code extensions for "dep-selector-libgecode-1.0.2.gem". It seems to be building an embedded version of gecode.
See if it would be possible to download and install a pre-built version of gecode from the platform repos.
(I should note that the build is doing a parallel make. It looks like it would go significantly faster on a virtual with 4 cores or more.)