Glen De Cauwsemaecker authored Nov 08, 2016 and Jeremy Soller committed Nov 08, 2016

* update bootstrap.sh script

+ macOS users using MacPorts are now supported (fix issue #720);
+ dependencies for macOS users using brew have been updated;
+ the boot step can now be skipped with the '-d' flag, effectively only installing dependencies

* update summary build instructions in README dependencies step

as these are meant as quick instructions, it's probably better to simply use the bootstrap.sh script available in the repo root folder, using the '-d' flag to just install the dependencies, using whatever package manager is available for the host system, rather than forcing the user to manually install those one by one