Added documentation.
Renamed to .md extension.
Made the relevant fd classes Writables.
tabs -> spaces
Int2Int CDF now a Writable.
More tabs -> spaces
TopScoredInts is now a Writable; fixed bug related to breaking scoring ties.
Tweaked boilerplate.
tabs -> spaces
Made map interfaces more consistent; more consistent testing.
Reformat source.
Implemented interfaces in latest snapshot of lintools-datatypes
Minor tweaks.
Merge branch 'refactoring'