Helpful error messages for bogus template dir.

elsif !File.exists?(File.dirname(app.output_dir))

  puts "Oh noes!  The parent directory for #{output_dir} doesn't exist."

  exit(1)

elsif !File.exists?(app.template_dir + "/extjs")

  puts "Oh noes!  The template directory does not contain extjs/ directory :("

  puts "Please copy ExtJS over to template/extjs or create symlink."

  puts "For example:"

  puts "    $ cp -r /path/to/ext-4.0.0 " + app.template_dir + "/extjs"

  exit(1)

elsif !File.exists?(app.template_dir + "/resources/css")

  puts "Oh noes!  CSS files for custom ExtJS theme missing :("

  puts "Please compile SASS files in template/resources/sass with compass."

  puts "For example:"

  puts "    $ compass compile " + app.template_dir + "/resources/sass"

  exit(1)

end

app.run()