dwhois.config: do not add additional trailing slash to api_base_url
dwhois.config: check that api_base_url is set before indexing

Raised an IndexError when api_base_url was not set
dwhois-user: use configured username as default
dwhois.worker: show body content in error output
dwhois.whois: validate domain names before passing them as argument to whois command
dwhois.whois: added strict input validation
dwhois.whois: add -- to argv

prevents external input from being treated as an argument to whois
dwhois.whois: fixed whitespace errors
version 0.7
debian version 0.7-1