Add Makefile with coverage target for Unity

 Unity is at 92% coverage now
 Run 'make -s' to see coverage information for unity.c
 Run 'make uncovered' to get missing lines output

test/Makefile

+CC = gcc
+ifeq ($(shell uname -s), Darwin)
+CC = clang
+endif
+#DEBUG = -O0 -g
+CFLAGS += -std=c99 -pedantic -Wall -Wextra -Werror
+CFLAGS += $(DEBUG)
+DEFINES = -D UNITY_OUTPUT_CHAR=putcharSpy -D UNITY_INCLUDE_DOUBLE
+SRC = ../src/unity.c tests/testunity.c build/testunityRunner.c
+INC_DIR = -I ../src
+COV_FLAGS = -fprofile-arcs -ftest-coverage -I ../../src
+BUILD_DIR = build
+TARGET = build/testunity-cov.exe
+
+# To generate coverage, call 'make -s', the default target runs.
+# To see missing coverage, follow up with 'make uncovered'.
+# For verbose output of all the tests, run 'make test'.
+default: coverage
+.PHONY: default coverage uncovered test clean
+coverage: $(BUILD_DIR)/testunityRunner.c
+	cd $(BUILD_DIR) && \
+	$(CC) $(CFLAGS) $(DEFINES) $(foreach i,$(SRC), ../$i) $(COV_FLAGS) -o ../$(TARGET)
+	rm -f $(BUILD_DIR)/*.gcda
+	./$(TARGET) | grep Tests -A1
+	cd $(BUILD_DIR) && \
+	gcov unity.c | head -3
+
+uncovered:
+	grep '###' $(BUILD_DIR)/unity.c.gcov -C2 || true
+
+test: $(BUILD_DIR)/testunityRunner.c
+	$(CC) $(CFLAGS) $(DEFINES) $(INC_DIR) $(SRC) -o $(TARGET)
+	./$(TARGET)
+
+$(BUILD_DIR)/testunityRunner.c: tests/testunity.c | $(BUILD_DIR)
+	awk $(AWK_SCRIPT) tests/testunity.c > $@
+
+AWK_SCRIPT='/^void test/{ declarations[d++]=$$0; gsub(/\(?void\)? ?/,""); tests[t++]=$$0 } \
+       END{ print "\#include \"unity.h\" //Autogenerated by awk in Makefile" ; \
+            for (i=0; i<d; i++) { print declarations[i] ";" } \
+            printf "int main()\n{\n  UNITY_BEGIN();\n" ; \
+            for (i=0; i<t; i++) { print "    RUN_TEST(" tests[i] ");" } \
+            printf "  return UNITY_END();\n}\n" }'
+
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
+
+clean:
+	rm -f $(BUILD_DIR)/$(TARGET) $(BUILD_DIR)/*.gc* $(BUILD_DIR)/testunityRunner.c