Merge pull request #156 from SvenDowideit/quotes-around-paths

put quotes around paths - they can have spaces
Merge pull request #157 from SvenDowideit/boot2docker-data-faq

document a little of what 0.5 has
Creates all files in a working directory

Creates a new directory (~/.boot2docker) which will contain all the
files (iso, vmdk). Otherwise your whole filesystem is littered with
files.
update to use simpler defaulting syntax