This revision includes the following changes:

 - [1] The plugin home page's CSS and JS files have been condensed into two minified file to save bandwidth. Also, now that the database stores the URL to each of the courses, the code for generating the links to each course has been simplified.
 - [2] The root plugin file can now highlight the navigation link on the menu bar. It is also set up to work with SEO-friendly URLs for browsing a course's available books.
 - [3] The IndexDen class's search method now returns the ID of the books in its search results
 - [4] The Interception_Manager class has been enhanced to enable a plugin to highlight its own link on the main navigation bar
 - [5] The Book_Courses class has its URLPurify() method removed since all course URLs are now stored in the database. A new method, getCourseInfo(), has been added to retrieve basic information about a particular course, useful for the browse books by course pages.
 - [6] The browse books by course page has been added.
 - [7] A series of 8 backgrounds have been added for use on the browse books by course page, 4 gears toward Arts and Letters courses, and the remaining 4 for Science, Engineering, and Mathematics courses. A credits text file for these photos has also been added.
 - [8] Several JS, CSS, and image files have been added in this revision, which are used on the search/explore section of the plugin home page. These files have simply been transfered from the sandbox/expiremental folder in a working state. All futher changes to these files will take place here and will be versioned.