Updated README with (hopefully) better explanation of the project.
Convenience API to avoid doing time:now_diff/2 in histograms all the time
Improved the guard in statman_histogram:record_value/2
Merge pull request #2 from blinkov/master

Convenience API to avoid doing time:now_diff/2 in histograms
Fix bug where gauges would incorrectly expire if only incr/decr was used instead of set/2.
Tag v0.4
Oops, tag v0.3.1
Only keep 2 digist when binning measurements for histograms.