Sourcemaps not included in karma configuration

**I'm submitting a bug report**

* **Library Version:**
0.32.0

**Please tell us about your environment:**
* **Operating System:**
Windows 10

* **Node Version:**
6.11.3

* **NPM Version:**
3.10.10

* **Browser:**
all

* **Language:**
all

* **Loader/bundler:**
Webpack

**Current behavior:**
Creating a new app using Webpack and Karma does not include sourcemaps while debugging karma tests

* **What is the expected behavior?**
To use sourcemaps while debugging karma tests

It appears there was an attempt to include this feature according to the issue here: https://github.com/aurelia/cli/pull/656.

The related PR updated a karma.conf.js file located here https://github.com/aurelia/cli/blob/master/lib/resources/content/karma.conf.js to use sourcemaps.

But the cli is still creating new apps using the karma configs located here
- https://github.com/aurelia/cli/blob/master/lib/resources/test/webpack/babel/karma.conf.js
- https://github.com/aurelia/cli/blob/master/lib/resources/test/webpack/typescript/karma.conf.js

Compare the generated templates in lib/resources/test/webpack/babel/karma.conf.js and lib/resources/test/webpack/typescript/karma.conf.js with lib/resources/content/karma.conf.js, which the issue identifies as already using sourcemaps. Regenerate a Webpack/Karma app and debug its tests to verify that sourcemaps are included in both configurations.

Written by the indexing model from the issue text.