Ensure that all builders include FloppyDirectories in the StepCreateFloppy options.
Changed the way the unit-tests in common/step_create_floppy_test work to use the static test-fixtures directory instead of creating the paths dynamically.
Removed a duplicate line of documentation from parallels-pvm.html.md that occurred during rebasing.
Moved the support for recursive paths from the floppy_files keyword to the new floppy_contents keyword.
Shifted some of the code around to add better logging of what's actually being copied.
Added a couple of unit-tests for the new floppy_contents implementation.
Ensured that all files that were being added were also being included in state.FilesAdded so that the older unit-tests will work.
Fixes the following vet reports:
common/step_create_floppy_test.go:79: possible formatting directive in Fatal call
common/step_create_floppy_test.go:89: possible formatting directive in Fatal call
common/step_create_floppy_test.go:180: possible formatting directive in Fatal call
common/step_create_floppy_test.go:190: possible formatting directive in Fatal call