Added some additional top-level Makefile targets for ease of use

`make onl-powerpc` makes components + installer + swi
Added prelinary deb signing to build process

Added a default, unsafe key so that packages are always
signed by *something*.  Use $ONL_GNUPGHOME to point to a
real, actually secure key.
Fixed build - removed more powerpc-as6700-32x-r0b files

Per Tim's commit acb01c8916f4b3b5bef4a3eef936ba94fd59ba68
Fixed KVM build issue

$ONL/builds/swi/i386/kvm created onl-$version-i386.swi but
$ONL/builds/kvm/i386/onl referenced onl-i386.swi

changed to both  onl-$version-i386.swi
Added a `make onl-kvm` target; simplified the build instuctions

Need to refactor the "Quick"Start because it got too long.
Added a script that emulates the user build process

Different from the ./tools/autobuild.sh because it types
the exact commands from the QuickStart guide.
Merge pull request #26 from capveg/master

Added .deb signing to build process; fix build issue