enable debug for gulp build task

source maps weren't really working unless debug was true
don't allow selection of time or control elements

We disable the hidden toggle on click feature whenever there is a
selection on the page (so that you can copy a block of text without it
hiding). However, clicking on the `.control` element to toggle the
hidden state sometimes triggers a selection which makes subsequent
clicks not toggle the hidden state. Therefore, just disable selection in
the `.control` and child elements.
add .DS_Store to gitignore
add favicon

from github's octicons font pack. created with photoshop with the help
of http://www.icoconverter.com/
add example application for gh-pages. no auth required