Nettoyage/amélioration scripts de build + bump version electron

Makefile

@@ -14,9 +14,7 @@ build:
 	curl --silent --location https://deb.nodesource.com/setup_0.12 | bash -
 	apt-get install --yes nodejs
 	npm install --ignore-scripts
-	npm run clean
-	npm run compile
-	npm run package -- --arch=$(ELECTRON_ARCH)
+	ARCH=$(ELECTRON_ARCH) npm run build
 
 install:
 	mkdir -p $(INSTALL_LOCATION)