0.1.0

Changes:

• Custom app & exec name / path support. Much more flexible now, less assumptions. See readme. #35 #37
• updater.checkNewVersion now always calls callback with newVersionExists argument and enforces semantic versioning. #36 #39
• updater.run just calls nw.gui.Shell.openItem for Windows & Mac. #37 #41
• updater.download now correctly handles 404s, etc. #34
• Improved docs.