Add Carthage to Travis-CI.

.travis.yml

@@ -10,18 +10,28 @@ env:
     - LANG=en_US.UTF-8
   matrix:
     - TEST_TYPE=iOS
-    - TEST_TYPE=CocoaPods
     - TEST_TYPE=Package
+    - TEST_TYPE=CocoaPods
+    - TEST_TYPE=Carthage
+install:
+- |
+  bundle install
+  if [ "$TEST_TYPE" = Carthage ]; then
+    brew update
+    brew install carthage || brew upgrade carthage
+  fi
 script:
 - |
     if [ "$TEST_TYPE" = iOS ]; then
       set -o pipefail
       xcodebuild test -workspace ParseTwitterUtils.xcworkspace -sdk iphonesimulator -scheme ParseTwitterUtils-iOS -configuration Debug -destination "platform=iOS Simulator,name=iPhone 4s" -destination "platform=iOS Simulator,name=iPhone 6s" GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=YES GCC_GENERATE_TEST_COVERAGE_FILES=YES | xcpretty
+    elif [ "$TEST_TYPE" = Package ]; then
+      bundle exec rake package:frameworks
     elif [ "$TEST_TYPE" = CocoaPods ]; then
       pod lib lint ParseTwitterUtils.podspec
       pod lib lint --use-libraries ParseTwitterUtils.podspec
-    elif [ "$TEST_TYPE" = Package ]; then
-      bundle exec rake package:frameworks
+    elif [ "$TEST_TYPE" = Carthage ]; then
+      carthage build --no-skip-current --platform iOS
     fi
 after_success:
 - |