Remove file path references from master CSS

Rails has changed the way it loads assets since the Rails 2 version of
the application and direct file mappings break the new schema.
Copy over BBYIDX intro images

Copy the .gif and .png versions of the intro page images from BBYIDX.
Build out case handling for front-page 'more' links

Use the Ideas#search action to render specific sets of results when the
search text matches a particular keyword. Rended only 'new' ideas
ordered by creation date when the search text consists only of 'new.'
Fix search_text param passing in home view

Ideas#search requires a 'search_text' value in its parameters. Change
the keyword to match this and use the newer Ruby hash key syntax.
Fix search ordering syntax
Show the 'Coming Soon' ideas on the front page

Enable the 'coming soon' idea-group to fill in the missing space now
that the application no longer uses 'nearby' ideas.
Reduce space between front-page idea-groups

Columns do not have enough space to fit on the same line with so much
margin between them. Reduce the spacing so they all fit (though is not
necessarily visually appealing).
Directly show the sign-up image as the link

Use the sign-up image as the link focus instead of relying on CSS
finagling to hide the link text.
Add User admin migration

Create migration to add an 'admin' boolean to the Users table.
Run User admin DB migration
Add link to Users' profile pages

  * Fix route to the 'users#show' action
  * Update link helper method in header layout
Use FriendlyID for Users
Merge branch 'master' into custom_admin
Use a 'before_action' in the Tags controller

Before the 'show' action, set the Tag to be shown with a
'before_action.'
Update User controller comments

Remove json format reference in the 'show' action.
Use FriendlyID for Tags