Some Features and Fixes

I have added some features that I found to be useful to me as well as some minor fixes and a couple changes

New folder switching method changes the url hash allowing for forward and
backwards native browser navigation. If the user navigates to a different folder
then clicks on a link, then hits back they will return to the folder they were
previously in instead of to the main page

Centered bookmarks in entries and fixed a border radius discrepancy

Changed the edit, delete, and settings buttons into vectors from bitmaps to allow for scaling and zooming without pixelization.

Made the bookmark thumbnails no longer distort in each entry by cropping off the bottom instead.

Switched from list drag sort library to standard jQuery UI library to fix a dragging bug with nested divs as well as add new features. One such feature is a deadzone to prevent the entry from being dragged until the mouse has moved 20 pixels.

Added the ability to view the folders as well as the bookmarks that exist in any parent folder. Clicking on the sub-folder icon will bring you to that folder. This feature is disabled by default.

Modified the method of displaying bookmarks when the minimum width has been reached. Instead of the columns extending off the page to the right the number of columns is instead reduced to allow each bookmark to appear on the vertical screen without need for horizontal scrolling.