Add .fade to div.modal in "Live demo" modal example code

BS3 commit 1e0c0b8f94bee92cd34e4b323b75543f38c2fb42
Update bower.json

BS3 commit a954f04a02a193959fd9d9c172c5004311a5cca1
only expand submenu docs links at >768px

BS3 commit 7b42b8b0fefa3511862040c58aaaf8f8b6800cbb