task 508 Accessibility Upgrade for SSDI Solutions

Implemented a series of code revisions to help ensure that SSDIsolutions.org is accessible and meets the Federal requirements defined in Section 508 of the US Rehabilitation Act. The theme for this Drupal-based website uses Twitter Bootstrap as its front-end framework, which comes with a several JavaScript powered components used on the SSDI site (e.g., tabs and carousel). To help jumpstart the accessibilty improvements, I implemented the Bootstrap Accessibility Plugin, originally developed by PayPal. The nice plugin helped add attributes to these components to better support screen readers and other assitive technologies. I did discover a bug in the Plugin though, which required reverting back from Twitter Bootstrap 3.2 to 3.1.