Merge pull request #15 from pleary/master

Added ability to filter by user, place, and project
Merge pull request #16 from pleary/master

Made the points a little smaller
Merge pull request #17 from pleary/master

Updated README
Merge pull request #18 from pleary/master

Added ttl parameter to set cache header; Point size grows in higher zoom...
Merge remote-tracking branch 'upstream/master'