CP-1789 Enable karma file descriptions for loadFiles array

[svi3c]

This change enables the full file description capabilities of karma to the loadFiles array instead of only passing through the nocache flag.

For example you can now disable watching for changes on the files you want to load. I use this feature to only watch bundles for changes, which integrates gracefully with jspm's development bundling feature (you can reuse your bundle you built for the dev server to execute your tests by providing your spec modules within the bundle).

[evanweible-wf]

@maxwellpeterson-wf @trentgrover-wf @dustinlessard-wf @jayudey-wf

[evanweible-wf]

@svi3c could you add a brief description of the changes to this PR?

[rmconsole-wf]

@svi3c This pull request has merge conflicts, please resolve.

[maxwellpeterson-wf]

+1 @trentgrover-wf @evanweible-wf FYI @jayudey-wf

[evanweible-wf]

+1

[jayudey-wf]

QA Resource Approval: +10

• [x] Testing instruction (derived from discussion with Max)
• [x] Dev +1's
• [x] Dev/QA +10 with detail of what was tested
  • passing CI
• [x] Unit test created/updated
• [x] All unit tests pass

Merging into master.