Ensure estraverse version 1.2.0 or later
Add api.getAncestors
Don't report no-empty warnings when a parent is FunctionExpression / FunctionDeclaration

(fixes #70)
Merge branch 'master' of https://github.com/nzakas/eslint into ok

Conflicts:
	package.json
Merge pull request #71 from Constellation/estraverse-controller

Don't report no-empty warnings when a parent is FunctionExpression / FunctionDeclaration