Updated properties for Checkin, Page and Location

[timols]

Some of the properties for Checkins (such as likes) have been included and currently throw warnings.

I've added some new properties.

[Topguest]

Any chance we could get a version bump to include these new changes?

[mmangino]

I just built a new version. I'll push it as soon as rubygems is back up.

[timols]

Awesome! Thanks!