Fix HTML element ID typo on frontpage

Rename element to have the correct ID and have its appropriate CSS
properties applied.
Fix some frontpage content

Blog link needs to be split into multiple lines in the template so the
link renders correctly.
Remove admin notes in error page templates
Copy old BBYIDX favicon
Copy over BBYIDX's Idea share/submit button image
Fix missing element classes in new Idea form

Input elements are missing their CSS classes. Add them back in to have
the elements pick up their CSS properties.
Fix image link for showing idea submission button

Rails handles image assets differently since Rails 2 so the relative
path should not be included any more.
Remove some intro-page CSS properties

Element height and the text alignment break the displayed content.
Remove the properties so the header titles can be appropriately
displayed.
Remove superfluous redirect in Idea creation

The create action requires users to be authenticated anyway. The
redirect is superfluous and does not serve a purpose if unauthenticated
users try to create an idea. Instead, Devise will redirect them to the
sign-in page before attempting to create the Idea.
Remove authentication requirement for completing tags

Users should not need to be authenticated when trying to autocomplete
tag names. Add the controller action to the exclusion list so that
users can see the autocompletiong list without signing in.
Bundle 'guard' into gemset

User 'guard' to auto-run relavent tests when a file is changed.
Create basic Guardfile

Create a Guardfile to map which tests to run when a file in the project
directory has been changed.
Fill out Idea controller pending specs

Complete specs for the Idea controller's 'search' and
'autocomplete_tag_name' actions.
Remove duplicate request spec

Somehow, a duplicate Currents request spec was generated. Remove the
duplicate and its pending specs.
Sign in user before Idea edit request
Fill out remaining Idea request specs
Fix idea redirect after creation
Merge branch 'specs'