Add RS Hack Day and Decentralize.js

1. We're throwing a remoteStorage hack day on Saturday for people who don't attend JSConf. Added full details.
2. We're organizing a Decentralize.js evening meetup, presenting/discussing projects that use JavaScript (one way or another) for re-decentralizing the Web. Examples would be P2P apps using WebRTC, unhosted web apps, Sockethub, Hood.ie, et al. We're still fleshing out the details; partial info added.
3. Fix typos.