conduct: add nationality and language to protected characteristics

Via: @k1tm https://github.com/joyent/nodejs-advisory-board/pull/11#issuecomment-63083056
Original PR-URL: https://github.com/joyent/nodejs-advisory-board/pull/11
Merge pull request #2 from isaacs/master

conduct: add nationality and language to protected characteristics
Merge branch 'master' of https://github.com/mikeal/nodejs-advisory-board

Conflicts:
	conduct.md