A better `checkNewVersion`

#36
Typo
Merge pull request #39 from edjafarov/better-check-new-version

A better `checkNewVersion`
Typos
Using nw.gui.Shell.open for updater.run on Windows & Mac
gui.Shell.open -> gui.Shell.openItem
Merge pull request #41 from edjafarov/gui-shell-open-run

updater.run uses gui.Shell.openItem for Windows & Mac
Merge branch 'master' of https://github.com/edjafarov/node-webkit-updater into custom-names

Conflicts:
	README.md
	app/package.json
	app/updater.js
	package.json
Merge branch 'master' of https://github.com/edjafarov/node-webkit-updater into custom-names

Conflicts:
	README.md
	app/package.json
	app/updater.js
	package.json