added !acc command
Changed accuracy to correctly reflect input with slight rounding. Added
mod-compatibility (needed to remember mods of last song info). Added
error message when no PercentageEstimates are available. Changed acc
argument of formInfoMessage to Double,
using null as the "nothing" argument. Removed BeatmapMeta.getPPForAcc
method. Formatting.
Merge pull request #10 from ThePooN/master including some polishing