Add travis support

.travis.yml

@@ -0,0 +1,37 @@
+os: osx
+osx_image: xcode10.1
+language: swift
+env:
+    global:
+        - LANG=en_US.UTF-8
+        - PROJECT="PlaceholderKit.xcodeproj"
+        - SCHEME="PlaceholderKit"
+        - IOS_SDK=iphonesimulator12.0
+        - OSX_SDK=macosx10.14
+    matrix:
+        - >-
+            DESTINATION="arch=x86_64" SDK="$OSX_SDK" SCHEME="$SCHEME"
+            RUN_TESTS="YES" BUILD_EXAMPLE="NO" POD_LINT="NO"
+        - >-
+            DESTINATION="OS=12.0,name=iPhone 7" SDK="$IOS_SDK" SCHEME="$SCHEME"
+            RUN_TESTS="YES" BUILD_EXAMPLE="YES" POD_LINT="YES"
+before_install:
+    - gem install --no-ri --no-rdoc cocoapods --pre # Required as CocoaPods is throwing errors on the example project
+script:
+    - set -o pipefail
+    - 'if [ $POD_LINT == "YES" ]; then pod lib lint; fi'
+    # - >-
+    #     if [ $BUILD_EXAMPLE == "YES" ]; then xcodebuild clean build -project
+    #     Examples/TableViewExample/TableViewExample.xcodeproj -scheme
+    #     TableViewExample -sdk "$SDK" -destination "$DESTINATION"; fi
+    - >-
+        if [ $RUN_TESTS == "YES" ]; then xcodebuild clean test -project
+        "$PROJECT" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION"
+        ONLY_ACTIVE_ARCH=NO CODE_SIGNING_REQUIRED=NO; fi
+    - >-
+        if [ $RUN_TESTS != "YES" ]; then xcodebuild clean build -project
+        "$PROJECT" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION"
+        ONLY_ACTIVE_ARCH=NO CODE_SIGNING_REQUIRED=NO ; fi
+    - swift test
+after_success:
+    - 'bash <(curl -s https://codecov.io/bash)'