vala: bring binding up to spec 0.9.1 rev 4 and update tests

Author: WasabiFan

vala/Makefile

@@ -7,9 +7,12 @@ lib:
 	$(VALAC) --library=ev3dev-lib -H ./bin/ev3dev-lib.h ./ev3dev-lib.vala -X -fPIC -X -shared --vapi=./bin/ev3dev-lib.vapi --pkg gio-2.0 --pkg glib-2.0 -X -lm -o ./bin/ev3dev-lib.so
 
 tests:
-	$(VALAC) "./bin/ev3dev-lib.vapi" ./ev3dev-test.vala -X ./bin/ev3dev-lib.so -X -Ibin/. -o ./bin/ev3dev-test
+	$(VALAC) "./bin/ev3dev-lib.vapi" ./ev3dev-test.vala -X ./bin/ev3dev-lib.so -X -Ibin/. -o ./bin/ev3dev-test --pkg gio-2.0 --pkg glib-2.0
 
 all: lib tests
-	
+
+clean:
+	rm -rf ./bin
+
 run:
 	$(exec)