fixing tests to work with node0.10 up to browserify2.13
Merge branch 'master' of github.com:thlorenz/browserify-shim

* 'master' of github.com:thlorenz/browserify-shim:
  2.0.5 overriding exports to be able to shim modules that try to use them
  fixing impressjs path
  note in underscore test
  fixing underscore shim issue by making exports undefined as well
  reproducing underscore shim issue since it looks for 'exports'