around_me_in does't work right on python 3.4

[jenyacazacu]

When using python 3.4 and requesting a leaderboard with a page_size=1 it returns the incorrect member due to the way python 3 handles division on line 1007 in leaderboard/leaderboard.py. The work around was to cast to int, so that fixed it for any page size.

starting_offset = reverse_rank_for_member - (page_size / 2)

should be

starting_offset = reverse_rank_for_member - int(page_size / 2)

[GraylinKim]

Thanks for reporting this issue. I've added a test and submitted a patch.

[jenyacazacu]

awesome, thx