pre-build libraries for Julia packages and create default git config

Build and install native dependencies of bundled Julia packages in base image. Reduces build time and space requirement for Julia packages (Dockerfile v13).

Also generating a default git config for users on first login. 

FYI the conversation of switching debian/ubuntu ipopt to serial MUMPS continues here http://list.coin-or.org/pipermail/ipopt/2014-September/003833.html