Implement release make rule

Makefile

@@ -94,5 +94,11 @@ installer-linux: release/installers/Etcher-linux-x64.tar.gz release/installers/E
 installer-win32: release/installers/Etcher-x64.exe release/installers/Etcher.exe
 installer-all: installer-osx installer-linux installer-win32
 
+release:
+	rm -rf node_modules
+	npm install --force
+	npm test
+	make installer-all
+
 clean:
 	rm -rf release/

PUBLISHING.md

@@ -3,23 +3,20 @@ Publishing Etcher
 
 This is a small guide to package and publish Etcher to all supported operating systems.
 
-Packaging
----------
+Prequisites
+-----------
 
-You need to install [wine](https://www.winehq.org) and [nsis](http://nsis.sourceforge.net/Main_Page) to package the application for Windows.
+- [wine](https://www.winehq.org)
+- [nsis](http://nsis.sourceforge.net/Main_Page)
+- [node](https://nodejs.org)
+- [GNU Make](https://www.gnu.org/software/make/)
 
-Make sure you install npm dependencies with `--force` since there might be optional dependencies for an operating system not equal to the host that will not make it to the package otherwise:
+Run the following command to make installers for all supported operating systems:
 
 ```sh
-npm install --force
+make release
 ```
 
-Run the following command to package Etcher
-
-```sh
-make installer-all
-```
-
-The resulting packages will be saved to `release/installers`.
+The resulting installers will be saved to `release/installers`.
 
 You can run `make clean` to start in a fresh state.