Peg node-sass dependency to 1.0.3.

No Issue.
- grunt-sass has node-sass as a dependency (^1.0.0) but the build
  requirements of node-sass version 1.1.0 have changed and will
  fail without a newer version of the gnu compilers.
Merge pull request #4355 from jaswilli/deps-sass

Peg node-sass dependency to 1.0.3.