Generate coverage stats using slather/Coveralls

- Modify project file to generate code coverage metrics
- Use slather plugin in Podfile to generate code coverage for projects
  included as CocoaPods
- Modify .travis.yml to update CocoaPods gem and install activesupport;
  default CocoaPods version on Travis CI does not support Podfile plugins,
  and depends on activesupport
- Add step to .travis.yml to install slather and send metrics to
  Coveralls
- Add .slather.yml to configure how we send metrics to Coveralls
- Add coverage files to .gitignore

.gitignore

@@ -3,4 +3,5 @@ Example/WildeGuess/Pod
 *xcuserdata
 *.xcworkspace
 appledoc
+*.gcov
 

.slather.yml

@@ -0,0 +1,5 @@
+service: travis_ci
+coverage_service: coveralls
+xcodeproj: ComponentKit.xcodeproj
+source_directory: ComponentKit
+

.travis.yml

@@ -1,11 +1,16 @@
 language: objective-c
 
 before_install:
-  - gem install cocoapods
+  - gem install activesupport
+  - gem update cocoapods
+  - gem install slather
 
 script: ./build.sh ci
 
 # Whitelist for branches
 branches:
   only:
     - master
+
+after_success:
+  - slather

ComponentKit.xcodeproj/project.pbxproj

@@ -748,6 +748,8 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_GENERATE_TEST_COVERAGE_FILES = YES;
+				GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
@@ -789,6 +791,8 @@
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_GENERATE_TEST_COVERAGE_FILES = YES;
+				GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;

Podfile

@@ -3,18 +3,12 @@ source 'https://github.com/CocoaPods/Specs.git'
 
 platform :ios, '7.0'
 
+plugin 'slather'
+
 link_with 'ComponentKitTests',
           'ComponentKitApplicationTests',
           'ComponentTextKitApplicationTests'
 pod 'ComponentKit', :path => '.'
 pod 'ComponentKitTestLib', :path => './ComponentKitTestLib'
 pod 'OCMock', '~> 2.2'
 
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