coveralls code coverage (#221)

* coveralls added
* enable code coverage

Author: arafay-folio3

.slather.yml

@@ -0,0 +1,5 @@
+coverage_service: coveralls
+xcodeproj: OptimizelySDKiOS/OptimizelySDKiOS.xcodeproj
+scheme: OptimizelySDKiOS
+workspace: OptimizelySDK.xcworkspace
+configuration: Release

.travis.yml

@@ -11,9 +11,12 @@ env:
     - SCHEME=OptimizelySDKiOS-Universal TEST_SDK=iphonesimulator PLATFORM='iOS Simulator' OS=9.3 NAME='iPhone 6s'
     - SCHEME=OptimizelySDKTVOS TEST_SDK=appletvsimulator PLATFORM='tvOS Simulator' OS=10.2 NAME='Apple TV 1080p'
     - SCHEME=OptimizelySDKTVOS-Universal TEST_SDK=appletvsimulator PLATFORM='tvOS Simulator' OS=9.2 NAME='Apple TV 1080p'
+before_install: 
+  - gem install slather --no-rdoc --no-ri --no-document --quiet
 script:
   - pod spec lint --quick
-  - if [[ "$TRAVIS_BRANCH" == "master" ]]; then xcodebuild test -quiet -workspace OptimizelySDK.xcworkspace -scheme $SCHEME -configuration Release CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO -sdk $TEST_SDK -destination "platform=$PLATFORM,OS=$OS,name=$NAME" | egrep -B 10 -A 10 "(error|warning|failed|crash|exit|FAILED|Failing|failures)"; fi
+  - if [[ "$TRAVIS_BRANCH" == "master" ]]; then xcodebuild test -quiet -workspace OptimizelySDK.xcworkspace -scheme $SCHEME -configuration Release CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO -sdk $TEST_SDK -destination "platform=$PLATFORM,OS=$OS,name=$NAME" ONLY_ACTIVE_ARCH=YES | egrep -B 10 -A 10 "(error|warning|failed|crash|exit|FAILED|Failing|failures)"; fi
 after_success:
+  - slather
   - sleep 5 # https://github.com/travis-ci/travis-ci/issues/4725
 

OptimizelySDKiOS/OptimizelySDKiOS.xcodeproj/xcshareddata/xcschemes/OptimizelySDKiOS.xcscheme

@@ -27,7 +27,8 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       language = ""
-      shouldUseLaunchSchemeArgsEnv = "YES">
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES">
       <Testables>
          <TestableReference
             skipped = "NO">