message: Enable file upload tests
  (see https://github.com/vlucas/frisby/pull/374)
diff: @@ -9,7 +9,7 @@ const URL = 'http://localhost:3000'
  describe('/file-upload', function () {
  var file, form
  - xit('POST file valid for client and API', function (done) {
  + it('POST file valid for client and API', function (done) {
  file = path.resolve(__dirname, '../files/validSizeAndTypeForClient.pdf')
  form = new FormData()
  form.append('file', fs.createReadStream(file))
  @@ -19,7 +19,7 @@ describe('/file-upload', function () {
  .done(done)
  })
  - xit('POST file too large for client validation but valid for API', function (done) {
  + it('POST file too large for client validation but valid for API', function (done) {
  file = path.resolve(__dirname, '../files/invalidSizeForClient.pdf')
  form = new FormData()
  form.append('file', fs.createReadStream(file))
  @@ -29,7 +29,7 @@ describe('/file-upload', function () {
  .done(done)
  })
  - xit('POST file with illegal type for client validation but valid for API', function (done) {
  + it('POST file with illegal type for client validation but valid for API', function (done) {
  file = path.resolve(__dirname, '../files/invalidTypeForClient.exe')
  form = new FormData()
  form.append('file', fs.createReadStream(file))
  @@ -39,7 +39,7 @@ describe('/file-upload', function () {
  .done(done)
  })
  - xit('POST file too large for API', function (done) {
  + it('POST file too large for API', function (done) {
  file = path.resolve(__dirname, '../files/invalidSizeForServer.pdf')
  form = new FormData()
  form.append('file', fs.createReadStream(file))
  