Merge pull request #80 from nlevitt/ari-3617-data-remote

ExtractorHTML when a/@href links include the attribute data-remote="true...
do not require "+" (plus sign) before @OPERATOR_CONTACT_URL@ in user-agent -- many bots including googlebot have the +, but some don't, so having it in the default template seems sufficient
Merge branch 'ari-3724' into qa