EarlGrey

Custom EarlGrey framework

• Change custom framework's DYLIB_INSTALL_NAME_BASE from @rpath to @executable_path
• Add custom framework to CopyFilesBuildPhase in the test target
• Update DYLD_INSERT_LIBRARIES environment variable in the test target scheme to @executable_path/EarlGrey.framework/EarlGrey:@executable_path/CustomEarlGrey.framework/CustomEarlGrey