Rake build missing dependency #25
Description
When running 'bin/rake spec' on a fresh ubuntu box the build will fail complaining about missing libunwind.h. This can be fixed by first running 'sudo apt-get install libunwind8-dev'. I am not familiar with ruby so i don't know the proper place to add this dependency in the build chain, but it should be added no the less.
For less experienced ruby users it would also be nice to specify that bundle and ruby must be installed through RVM. It took an annoying amount of time to realize that using the installing bundle through the linux package manager was not a supported build path.