appears to break webpack-dev-server bundles

**Note**: I discovered this issue when using Meteor's Velocity test runner, which uses `source-map-support`. The file `velocity_source-map-support.js` in the console errors is the Meteor-minified and -bundled version of this package.

Please don't inadvertently prevent code from running if there are any errors loading the source map. I haven't determined exactly how this prevents my webpack bundled code from running, but I have determined that:
1) the webpack bundle loads and attempts to execute the transpiled modules in eval() statements
2) somehow the content of the eval()s never seem to run though
3) when I remove the `sanjo:jasmine` Meteor package (thus transitively remove `velocity:source-map-support`), all of my webpack bundled code runs as usual.