Started working on adding challenge date range scope to a users activities
Changed the scope of all activity lists and sums to the current users chanllenge
Refactoring how the yellow jersey is ascertained
Refactored the yellow_jersey methods to be highest kilometers and scoped by challange date
Merge branch 'jh_fix_yellow_jersey_calc_to_scope_by_challenge_dates' into jh_add_a_new_activity
Travis CI test