Revert "Merge pull request #77 from rvagg/nan"

This reverts commit a8abb06b9e0fe3e07026091c09b69e54da0174fa, reversing
changes made to 899a40915df2a69d3886d22f803416cc9e44d4d4.

Conflicts:
	package.json
2.1.1
Merge branch 'master' of github.com:node-xmpp/node-expat