updated obtainJS
initialis GlyphSet.contents as undefined
more tests for GlyphSet
dependency injection of the I/O module
obtainJS based start of modular I/O
switch to new I/O api
add io module for easier unit testing
reminder that io/main module is deprecated
marked plistLib.readPlistFromFile as deperecated
some bugfixes
add test for GlyphSet writeContents
remove dependency on readPlistFromFile