.xcodeproj: Only generate coverage info as CI step

Fixes facebookarchive#65.

Running the `slather setup` command as part of dc4c90d caused coverage info
to be generated for all build configurations; see
SlatherOrg/slather#73. This is problematic, as it
caused linker errors when the library is used in other projects.

Disable coverage settings in the FBKVOController.xcodeproj, and instead
pass command-line options to the CI step to generate coverage metrics.
In order to do so, this commit overrides the default build script used
by Travis CI; see
http://docs.travis-ci.com/user/languages/objective-c/#Default-Test-Script.

.travis.yml

@@ -4,10 +4,9 @@ before_install:
   - brew reinstall xctool
   - gem update cocoapods
   - gem install slather
-xcode_workspace: FBKVOController.xcworkspace
-xcode_scheme: FBKVOController
-xcode_sdk:
-  - iphonesimulator7.0
-  - iphonesimulator7.1
+script:
+  - xctool -workspace FBKVOController.xcworkspace -scheme FBKVOController -sdk iphonesimulator7.0 build test GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=YES GCC_GENERATE_TEST_COVERAGE_FILES=YES
+  - xctool -workspace FBKVOController.xcworkspace -scheme FBKVOController -sdk iphonesimulator7.1 build test GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=YES GCC_GENERATE_TEST_COVERAGE_FILES=YES
 after_success:
   - slather
+

FBKVOController.xcodeproj/project.pbxproj

@@ -408,8 +408,6 @@
 				COPY_PHASE_STRIP = NO;
 				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",
@@ -448,8 +446,6 @@
 				COPY_PHASE_STRIP = YES;
 				ENABLE_NS_ASSERTIONS = NO;
 				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;