fix init, bump memory, force clean

- xhyve has an issue with the latest boot2docker.iso... see machine-drivers/docker-machine-driver-xhyve#229
- bump init initial memory
- force clean

Makefile

@@ -1,6 +1,19 @@
+.PHONY: iso
+iso:
+	cd ~/.docker/machine/cache/ && \
+		[[ $$(md5sum boot2docker.iso | awk '{print $$1}') != "7be437b191dddfe40d6f9ef85684cce0" ]] && \
+		curl -LO https://github.com/boot2docker/boot2docker/releases/download/v19.03.5/boot2docker.iso || \
+	true
+
 .PHONY: init
-init:
-	docker-machine create --driver xhyve --xhyve-virtio-9p /Users/gnawhleinad --xhyve-virtio-9p-root / dev
+init: iso
+	docker-machine create \
+		--driver xhyve \
+		--xhyve-boot2docker-url ~/.docker/machine/cache/boot2docker.iso \
+		--xhyve-virtio-9p /Users/gnawhleinad \
+		--xhyve-virtio-9p-root / \
+		--xhyve-memory-size 2048 \
+		dev
 
 .PHONY: start
 start:
@@ -9,6 +22,6 @@ start:
 
 .PHONY: clean
 clean:
-	docker-machine stop dev
+	docker-machine stop dev || true
 	docker-machine kill dev 2>/dev/null || true
 	docker-machine rm --force dev