Allow users and funders to comment back and forth on their applications

[Dfeng6789]

initial changes to allow users to comment on their applications, may still need to check that a user is commenting only on their own application

[codecov[bot]]

Codecov Report

Merging #304 (21e2fa8) into master (05e99b3) will decrease coverage by 0.17%. The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
- Coverage   75.62%   75.45%   -0.18%     
==========================================
  Files          10       10              
  Lines        1042     1047       +5     
==========================================
+ Hits          788      790       +2     
- Misses        254      257       +3     

Flag	Coverage Δ
backend	75.45% <22.22%> (-0.18%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
app/views.py	54.87% <22.22%> (-0.28%)	:arrow_down:

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