Code review comment for lp:~hjd/widelands/boost-system-dependency

It isn't shown by the diff below, but `.travis.sh` installs `libboost-all-dev`, which is a metapackage to install all boost components. This is likely the reason why this wasn't discovered until merged to trunk, since the Debian packaging is more minimal and only list the required components. Should we change this, so that travis also only installs the specific components we use?

(I think Debian/Ubuntu are one of the few distros to split up boost like this, so most other platforms where people do self-compile shouldn't see similar issues)