fix(links): in social.html

[ellerbrock]

hey spf13,

thanks for your great open source work! while playing with hugo (which is awesome!) i checked how the master is building his side and found some link problems. so here's a pr to fix it:

• remove facebook deadlink: http://www.facebook.com/stevefrancia
• remove spam link: https://gplus.to/spf13 and change it to google+ https://plus.google.com/+SteveFrancia
• switch to https instead of http for all other links in social

thats it ...

cheers maik