Require the importers
keep track of the subclasses of JekyllImport::Importer
require importers?
use ruby idiom in drupal7 importer
GoogleReader imports from Importer instead of Import
moved importers now in gemspec
Handle requiring of dependencies
Specify options in each importer
return list of commands and run validation automatically
Use Array.[] to collect gem dependencies
Merged in master.
Merge pull request #77 from jekyll/specify-commands

Allow the importers to specify their own commands & options