More robustly build links through to hash searches (from @johnpscott)
Require and use a new "twitter_api_proxy_url" option

This is to allow the continued use of jquery.tweet.js with Twitter's 1.1
API, via an intermediate proxy script such as those written by
@johnpscott and @StanScates. (Note that I am not claiming that these
changes make tweet.js compatible with those solutions: in particular,
@StanScates PHP backend would need updating to work out-of-the-box with
this new code.)