Added wrapper classes to widget, even/odd to list items, option to place...

... twitter follow button above or below list and admin options to control these.

Thought others could use the minor display tweaks I added here. Working with Twitter Bootstrap on a client site, I needed to be able to add some specific classes to the output of this widget, once complete, I realized others would probably appreciate these changes.

Also caught a typo in line 759 with an unclosed bracket.