Added show_links option

Used for bibcite, the show_links option (defaults to true) makes each citation a link to the correct reference. Works even when using bibshow multiple times on one page.
Added id for show_links option

Gives each reference a unique ID so it can be targeted by hyperlinks.
Update index.html

Added short description of the show_links option.
Update README.md

Added myself as a contributor
Merge pull request #92 from drjonnicholson/master

Adding hyperlinks to showbib