adding support for nested objects on resources

[edcohen08]

Support for nested resource on responses e.g.

Encounter(Resource):
    ....
    nested_objects = {'userRelatedToCalendarEvent': User}

encounter = patient.Encounter(id="abcdef").get(related_data=True)
user = encounter.userRelatedToCalendarEvent
<welkin.models.user.User object>

[codecov[bot]]

Codecov Report

Merging #25 (8fb03f7) into develop (71a7a04) will increase coverage by 0.16%. The diff coverage is 94.73%.

@@             Coverage Diff             @@
##           develop      #25      +/-   ##
===========================================
+ Coverage    92.13%   92.29%   +0.16%     
===========================================
  Files           20       20              
  Lines          801      818      +17     
===========================================
+ Hits           738      755      +17     
  Misses          63       63              

Impacted Files	Coverage Δ
welkin/models/base.py	81.81% <90.00%> (+0.40%)	:arrow_up:
test/test_encounters.py	96.96% <100.00%> (+0.41%)	:arrow_up:
welkin/models/encounter.py	92.68% <100.00%> (+2.68%)	:arrow_up:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.