Merge pull request #4 from lclementi/master

updated DESIGN with current API docs
Added the scheme
Update DESIGN.md
Scheme changes
renamed list_dev fields to match list_img
changed scheme, design
Update DESIGN.md

fixed some minor naming of functions
Merge pull request #5 from lclementi/patch-1

Update DESIGN.md
Error fixed when listing targets and the list is empty
Merge branch 'master' of github.com:dimm0/img-storage-roll
Two params for zfs speed up; nas server added to makefile; nas name changed in rocks commands
Update USING.md
Update README.md
Update USING.md
Moved all functions to common library
Continue refactoring; started tests
More tests
5 Tests passing
9 tests passing
11 tests