Create filesystem with a much higher inode count.

Reduce block size and dramatically decrease bytes-to-inode ratio to better
accommodate filesystems which contain a large number of relatively-small files
(say, for example, a bunch of NPM modules). This should resolve the "no space
left on device" issue we were seeing in the field.
Merge branch 'dev' of https://github.com/browndav/vm-toaster into dev