updated Makefile tasks

Makefile

@@ -1,13 +1,22 @@
 release:
+	mvn install -P release
+	zipalign -v 4 target/aircasting.apk aircasting.apk
+
+prepare:
 	mvn install -DskipTests=true -P release
 
 adb.install:
 	adb install -r target/aircasting.apk && adb shell am start -n pl.llp.aircasting/.activity.SplashActivity
 
-install: release adb.install
+install: prepare adb.install
 
 test:
 	mvn test
 
+verify:
+	jarsigner -verify -certs -verbose aircasting.apk
+	zipalign -c -v 4 aircasting.apk
+
 clean:
-	mvn clean
+	rm -rf target
+	rm -f *.apk