Limit the amount of group data we load  to MAX_ITEMS so that we don’t spawn too many async tasks. Fixes #411.
Better solution for #411 based on feedback from @nbradbury. Limit the number of ‘list’ type stats fragments to the STATS_GROUP_MAX_ITEMS constant value at the sql level.
Removing commented line.
Merge pull request #419 from wordpress-mobile/issue/411-stats-crash

Limit the amount of group data we load  to MAX_ITEMS so that we don’t sp...