Add Grant Funder tweet modal

[emiwatanabe422]

Description

Adds a modal to make it easy to send tweet when a grant is funded.

Checklist

• Read and conforms to the contributor guidelines
• Read and conforms to the style guidelines
• Linter status: 100% pass
• Added relevant tests
• Tests pass and code coverage has not decreased
• Changes don't break existing behavior
• Commit message follows commit guidelines
• Code documentation
• Completed: Code review by core team and any requested changes

Affected core subsystem(s)

Refers/Fixes

#4091

Testing and Sign-off

Contributor

• Read and followed the Contributor Guidelines
• Tested all changes locally
• Verified existing functionality
• Ran make test and everything passed!

Reviewer

• Affirm contributor guidelines have been followed and requested changes made
• CI tests and linting pass
• No conflicts (migrations, files, etc)
• Regression tested against staging or local deployment

Funder

• Validated requested changes were made to specification
• Bounty payout released to the contributor

[emiwatanabe422]

[codecov]

Codecov Report

Merging #4113 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4113   +/-   ##
=======================================
  Coverage   30.26%   30.26%           
=======================================
  Files         206      206           
  Lines       16361    16361           
  Branches     2154     2154           
=======================================
  Hits         4951     4951           
  Misses      11234    11234           
  Partials      176      176

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[SaptakS]

@emiwatanabe422 can you fix travis errors. It is just a linting issue to change double quote into single quote and then it should be good to go.

[owocki]

this looks good! cc @PixelantDesign for feedback from a product pespective