Fix install-ca-files to use basename, not path
Fix install-ca-files to use basename, not path

I ran into this while trying out the instructions in the README. This change was required so that it will read the file correctly and handle the linking.
dweinstein/boot2docker,ZuoGuocai/boot2docker,au-phiware/boot2docker,twinbit/boot2docker,nanobox-images/boot2docker,Zanadar/boot2docker,janrotter/boot2docker,frapposelli/boot2docker,mikesherov/boot2docker,andyneff/boot2docker,gesellix/boot2docker,andyneff/boot2docker,ZuoGuocai/boot2docker,ailispaw/boot2docker,qxo/boot2docker,vaginessa/boot2docker,cgvarela/boot2docker,nanobox-images/boot2docker,shliujing/boot2docker,jjn2009/boot2docker,xiongjungit/boot2docker,xiongjungit/boot2docker,whuwxl/boot2docker,onmomo/boot2docker,qxo/boot2docker,vaginessa/boot2docker,gesellix/boot2docker,power-dev-env/boot2docker,jjn2009/boot2docker,YujiOshima/boot2docker,shliujing/boot2docker,phamviet/boot2docker,jd-daniels/boot2docker,twinbit/boot2docker,dsalas1/boot2docker,boxofrox/boot2docker,jd-daniels/boot2docker,Zanadar/boot2docker,ccvermeulen/boot2docker,SvenDowideit/boot2docker,boxofrox/boot2docker,dezon/boot2docker,cgvarela/boot2docker,benjamingarcia/boot2docker,iamjakob/boot2docker,iamjakob/boot2docker,dsalas1/boot2docker,ailispaw/boot2docker,whuwxl/boot2docker,SvenDowideit/boot2docker,mikesherov/boot2docker,dweinstein/boot2docker,larsbutler/boot2docker,janrotter/boot2docker,onmomo/boot2docker,kxes/docktop-os,frapposelli/boot2docker,phamviet/boot2docker,jango2015/boot2docker,marius311/boot2docker,YujiOshima/boot2docker,power-dev-env/boot2docker,marius311/boot2docker,au-phiware/boot2docker,jango2015/boot2docker,tianon/boot2docker-legacy,boot2docker/boot2docker,dezon/boot2docker,ccvermeulen/boot2docker,larsbutler/boot2docker,benjamingarcia/boot2docker