0.9.11 seems to the min node version that runs successfully

Travis build is broken with `0.8.0`. so I incrementally tested from `0.8.0` to `0.9.11` to find the working min version.

this could also be avoided by coming up with a work around to the Travis error, which is: 

`Warning: Object #<Object> has no method 'tmpdir' Use --force to continue.` in `test/core/resolvers/resolver.js:461`