add installation instructions,fix install scripts permissions and add shebang to run.py

build-deb/Makefile

@@ -8,7 +8,10 @@ deb: man ../requirments.txt ../run.py ../flaskapp ../LICENSE
 	cp -r ../flaskapp/* flaskapp/var/flaskapp/flaskapp/
 	cp ../run.py flaskapp/var/flaskapp/
 	cp ../LICENSE flaskapp/var/flaskapp/
+	chmod -w luser/DEBIAN/*
+	chmod +w luser/DEBIAN/control
 	dpkg-deb --build flaskapp
+	chmod -w luser/DEBIAN/*
 clean:
 	rm -f flaskapp.deb
 	rm -f man/flaskapp.1