Default is to build fruitstrap only
Allow fruitstrap to be installed to /usr/local/bin through make install_os
Adding install/uninstall Makefile rules
Merge branch 'master' of github.com:j3k0/fruitstrap
Allow certificate configurable from make command line via make CERT="iPhone Developer: ..."
Added install instructions for make install_os
Cherry picking some Makefile improvements by mpurland