Add explicit script interpreter

My default shell doesn't know how to use makelinks.sh
Replace deprecated chrome.extension use with chrome.runtime equivalents

chrome.extension.onMessage and chrome.extension.sendMessage are not
available in content scripts on Chromium 29.0.1547.65 (shipping in
Ubuntu 13.10).

This requires Chrome >= 26 for the newer chrome.runtime namespace.
Replace chrome.extension.onMessage with chrome.runtime for Opera
showImages: add "hide view images tab" option
Disable username highlighting if first commenter deletes username

Fixes #597
Use .comment instead of .thing
Make sure .author matches the first comment if comment is deleted
Fix voting for parent hover, use jQuery events for RESUtils.hover
Use mouseleave instead of mouseout
Minor fixes
Bug fix and style fixes
Fix bug with vote classes, simplify code
More bugfixes to voting, simplify events, use $var for jQuery vars
"Show parent" popup now remains open after voting (fixes #547)
Re-add delegated event, split .hover handler
Make indentation fixes
Add radix to parseInt
Use .data() instead of .attr('data-')
Minor spacing and strict equality fixes
Use Date.now() instead of new Date().getTime()