Merge pull request #1210 from OpenTechFund/feature/1194-comment-editing

...ply/activity/templates/activity/include/listing_base.html

opentech/apply/funds/serializers.py

...s/templates/funds/applicationsubmission_admin_detail.html

...y/funds/templates/funds/applicationsubmission_detail.html

...h/apply/funds/templates/funds/includes/activity-feed.html

opentech/apply/funds/templatetags/markdown_tags.py

opentech/static_src/src/javascript/apply/edit-comment.js

opentech/static_src/src/sass/apply/components/_feed.scss

opentech/static_src/src/sass/apply/components/_wrapper.scss

requirements.txt