resolves #70 clipboardjs in source-blocks
include a clipboardjs button in each source blocks (listingblock)
- include the javascript link to clipboard.js
- include 05-clipboard.js to perform the logic of attachment
- include a new css file with the embedded icon
- perform the logic only if page-copy-to-clipboard is present or env.ASCIIDOC_COPY_TO_CLIPBOARD is true
Edited by Dan Allen