bump to 0.5.1
bump to 0.5.1

summera/email_reply_parser,jdpopkin/email_reply_parser,jdpopkin/email_reply_parser,wking/email_reply_parser,summera/email_reply_parser,apptentive-engineering/email_reply_parser,apptentive-engineering/email_reply_parser,github/email_reply_parser,rudirocks/email_reply_parser,github/email_reply_parser,wking/email_reply_parser,phyxin/email_reply_parser,phyxin/email_reply_parser