add members_only option. Missing tests
Merge branch 'master' into members_only-option
add _parse_raw_leaders helper function.

_parse_raw_leaders handles the common logic for parsing results data
from a leader query.
add tests for members_only option
rename internal method. _parse_raw_leaders -> _parse_raw_members
Merge remote-tracking branch 'origin/master' into members_only-option
return a dict with a single key  instead of an array of members
Merge pull request #10 from simonz05/members_only-option

add members_only option.