Remove extra margin
Remove underlines from menu items
Fix path to the menu images
add some padding to the book title
Remove the bottom border from the book title
add a white background color to the book nav
make book links slightly smaller
Do not make book navigation uppercase
Remove the top margin from the book title
also load default styles for books

naming the books css file book.css overrides the css provided by the module (also named book.css), so rename to include default styles.
Merge pull request #8 from mfairchild365/issue-3

update book navigation styles for 4.0