Fix STOU for Ruby 1.8.7
LIST and NLST accept globs again

Rewrote LIST and NLST entirely in Ruby, no longer shelling out to ls
or any other program.

Added FtpServer#list_format so that list output can be customized.
Support EPLF (Easily Parsed LIST Format)
Version bump to 0.3.0
Regenerate gemspec for version 0.3.0