Issue #2123: Longest posting streak; End of Year

One thing about this one: Do you know if Google Charts has some sort of way to automatically limit the number of displayed labels on the X-axis? Or... well, you may want to see how it looks on test data and decide whether it's worth spending much extra time. This is what it looks like if someone posted one time every day this year:

![Every day chart](http://files.adampash.com/s/ThinkUp_1A251D79.png)