fix: Travis CI build

* Bring back `xcpretty` on Travis
* Disable parallel tests of Kinvey target in Kinvey scheme. Actually
stalled output is caused by this setting and not `xcpretty`

Author: mbektchiev

.travis.yml

@@ -76,9 +76,9 @@ script:
 - set -o pipefail;
   case $PLATFORM in
   iOS)
-    travis_retry make test-ios;;
+    travis_retry make test-ios | xcpretty;;
   Mac)
-    travis_retry make test-macos;;
+    travis_retry make test-macos | xcpretty;;
   esac
 after_script:
 - date

Kinvey/Kinvey.xcodeproj/xcshareddata/xcschemes/Kinvey.xcscheme

@@ -52,7 +52,6 @@
       <Testables>
          <TestableReference
             skipped = "NO"
-            parallelizable = "YES"
             testExecutionOrdering = "random">
             <BuildableReference
                BuildableIdentifier = "primary"