if we get an invalid ip address string with an update (e.g. via myip=... param), return result code 'dnserr'

note: I did not find a better matching result code, seems like dyndns2 api is rather incomplete. :-(
implement delete API

Very similar to /nic/update and /nic/update_authorized, /nic/delete and /nic/delete_authorized delete
 the A or AAAA record, depending in the kind of IP address given.

 As this is a delete, the specific ip address value is ignored.
implement delete UI
remove view for legalese

we don't want to be responsible for its contents (do it yourself and, if in doubt, ask your lawyer).

depending on applicable law, you might be required to have multiple directly reachable views,
thus this one view was not flexible enough anyway,
document UI customization (overriding templates/includes)
implement custom template view, add docs for it
get_ip: if there is no A/AAAA record, anwer "none" (anwer "error" only in real error cases)
updated dd-wrt help with verified settings for dd-wrt v24-sp2 - thanks to Per Brax!
fix login url generation in activation_complate template, fixes #139
move jquery / bootstrap back to head, broke my socialshareprivacy stuff on nsupdate.info
Merge pull request #4 from nsupdate-info/master

update my repo