Resubmit - Api group model completion #650

[secondaryfun]

• Related Issue (include '#'): Group Model Update - Create connections for group functionality. #649

• Description of changes made:

Location: one-to-many relationship to Group added on Location Model
Profile: many-to-many relationship to Group added on Profile Model
Posts: one-to-many relationship to Group added on Post Model

• Is the feature complete/bug resolved/etc..: yes

• Any known bugs/strange behavior: no

• Is there specific feedback you would like on these changes:

Please check logic for "on_delete":

• Post Model - on_delete=models.CASCADE

• Location Model - on_delete=models.PROTECT

• Profile - blank

• Screenshot(s):
  
  
  Profile:
  

[secondaryfun]

From Zakk on previous PR:

You have it so that a location has a group, but you want that the other way (a group belongs to a location). Under the current setup, there can only be 1 group in a location, but just like in meetup, we want to potentially have lots of groups related to a location.

• DONE
  Can you update the fixtures to reflect these changes to the data? I.e. if a Post has to belong to a group, then can you add a group ID to the posts fixtures?

• DONE
  It looks like the changes from your other PR are in this one too, can you get rid of those changes from this PR? I.e. the changes to Bio.css, Bio.js, Icon.js, TextInputField.js, etc

• Error on the original branch. Resubmitted using this branch.

[0xZakk]

@secondaryfun This looks good!