Autocomplete attribute should not be mandatory

According to http://www.alfredforum.com/topic/5-generating-feedback-in-workflows/, the `autocomplete` attribute is optional. Not setting it is useful to have only an item that is only informational.

> autocomplete ( optional - Only available when valid = no )
> The autocomplete attribute is only used when the valid attribute has been set to 'no'. When attempting to action an item that has the valid attribute set to 'no' and an autocomplete value is specified, the autocomplete value is inserted into the Alfred window. When using this attribute, the arg attribute is ignored.
 
(I also added rspec to the Gemfile)