add coveralls (test coverage) support

Author: addoshi

.slather.yml

@@ -0,0 +1,4 @@
+ci_service: travis_ci
+coverage_service: coveralls
+xcodeproj: SWTableViewCell.xcodeproj
+source_directory: SWTableViewCell

.travis.yml

@@ -5,4 +5,6 @@ before_install:
   - pod install
 
 script:
-  - set -o pipefail && xcodebuild test -workspace SWTableViewCell.xcworkspace -scheme SWTableViewCell -sdk iphonesimulator ONLY_ACTIVE_ARCH=NO | xcpretty -c
+  - set -o pipefail && xcodebuild test -workspace SWTableViewCell.xcworkspace -scheme SWTableViewCell -sdk iphonesimulator ONLY_ACTIVE_ARCH=NO | xcpretty -c
+
+after_success: slather

SWTableViewCell.xcodeproj/project.pbxproj

@@ -435,6 +435,8 @@
 					"$(SDKROOT)/Developer/Library/Frameworks",
 					"$(inherited)",
 				);
+				GCC_GENERATE_TEST_COVERAGE_FILES = YES;
+				GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
@@ -472,6 +474,8 @@
 					"$(SDKROOT)/Developer/Library/Frameworks",
 					"$(inherited)",
 				);
+				GCC_GENERATE_TEST_COVERAGE_FILES = YES;
+				GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;