Implement /api/v1/campaigns/:id/reports/:reportid API endpoint

[farmdawgnation]

We need an endpoint to retrieve an individual report, which will probably end up being structured like:

• _id
• campaignId
• candidate
  • lastName
  • firstName
  • _id
• type
• year
• title
• receivedDate
• contributions: An array of objects that look like...
  • contributorName
  • contributorAddress
  • affiliation
  • receivedDate
  • contributionType
  • electionName
  • inKindDescription
  • inKindAmount
  • cashAmount

The endpoint to be implemented is:

GET /api/v1/campaigns/:campaignid/reports/:reportid

This should return an object shaped as described above.