Extend play time to 12 minutes.

Plus, a minor fix to styles.
Remove old notes from the sonification prototype.
Rename new.html to index.html
Adds a README and reduced size map of all posts.
Add plots of neighborhood posts and users.
Update R package

* Add documentation
* Add some neighborhood exploration logic
* Add license
* Switch to using ggsave in order to avoid aliasing
Add overall TOD polar plot for NYC.
Change text size and plot size for polar TOD plots.
Update all polar TOD images.
Add polar TOD image to the README.
Fix DESCRIPTION. Fix build.
Remove rgdal requirement.