fix doc for pkg.install and passing extra args to pkgin for verbose install
fix doc for pkg.install and passing extra args to pkgin for verbose install

sociateru/fabtools,AMOSoft/fabtools,hagai26/fabtools,bitmonk/fabtools,badele/fabtools,fabtools/fabtools,n0n0x/fabtools-python,pombredanne/fabtools,ronnix/fabtools,prologic/fabtools,davidcaste/fabtools,ahnjungho/fabtools,wagigi/fabtools-python