node: Move NPM into a separated pacakge

In order to reduce flash requirements and also to disallow running NPM on the target
move NPM out of the default NodeJS package.
In order to allow adding NPM via opkg install, move it to a separated
directory

Signed-off-by: Ygal Blum <ygal.blum@gmail.com>

lang/node-arduino-firmata/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NPM_NAME:=arduino-firmata
 PKG_NAME:=node-$(PKG_NPM_NAME)
 PKG_VERSION:=0.3.3
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/shokai/node-arduino-firmata.git
@@ -28,7 +28,7 @@ PKG_LICENSE_FILES:=LICENSE.txt
 include $(INCLUDE_DIR)/package.mk
 
 define Package/node-arduino-firmata
-  DEPENDS:=+node
+  DEPENDS:=+node +node-npm
   SUBMENU:=Node.js
   SECTION:=lang
   CATEGORY:=Languages