Created a view for a slider that cycles through top donors. Several images had to be cropped for this. The JS file has to be externally loaded because this will go in pages written in .md rather than HAML.
Changed name and location of thumbnail files.
Added a helper method to retrieve the thumbnail image for a donor based on name.
Created HTML elements using a loop and database query rather than hardcoding.
Made JS behavior more abstract to accommodate any number of donors properly.
Merge branch 'staging' of https://github.com/code-dot-org/code-dot-org into donor_slider

Merging donor_slider into staging
Changed interval and added fadeIn/fadeOut. Removed unused variable.
Changed default display style.
Added slider to bottom of homepage.
Adjusted thumbnail images to fit better.
Adjusted width for better fitting in column layout.
Merge branch 'staging' of https://github.com/code-dot-org/code-dot-org into donor_slider
Slightly more friendly to small screens.
Updated thumbnail assets.
Made widths and heights percentage-based. Removed empty selector. Platinum badges are now 50% of page.
Changed standard indentation to two spaces. Added comments. Changed state check to use variable equation rather than DOM.
Specified different dimension calculations for images based on whether a sponsor is a platinum donor or a gold one.
Merge pull request #49 from code-dot-org/donor_slider

Donor slider added to front page (bottom).