sha,message,author_date,committer_date,raw_author,raw_committer,repo,author,committer
771b0ee34789750fdec176c3129eeaa6a6523041,"Initial implementation of ?_group_count=column

URL shortcut for counting rows grouped by one or more columns.

?_group_count=column1&_group_count=column2 works as well.

SQL generated looks like this:

    select ""qSpecies"", count(*) as ""count""
    from Street_Tree_List
    group by ""qSpecies""
    order by ""count"" desc limit 100

Or for two columns like this:

    select ""qSpecies"", ""qSiteInfo"", count(*) as ""count""
    from Street_Tree_List
    group by ""qSpecies"", ""qSiteInfo""
    order by ""count"" desc limit 100

Refs #44

Still todo: clean up code a bunch (it currently fakes being a 'view'), get
foreign key expansion working.",2017-11-20T06:04:13Z,2017-11-20T06:04:13Z,13ae486343ea6454a93114c6f558ffea2f2c6874,13ae486343ea6454a93114c6f558ffea2f2c6874,107914493,9599,9599