Allow image to be built as non-root user
Instructions for including ports.
Change default build to build as user, integration of fakeroot.
For the carambola2 platform generate a combined flash file as well.
Updated the README files
Whitespace fixes
Fixes issue with missing user 'nobody' or '_dhcp'
Merge pull request #21 from pastcompute/enh-user-build

Enh user build