Upgrade js-data-http to 2.2.4

[ScottTrenda]

Uses the fix from js-data/js-data-http#75 in js-data-angular.

• - npm test succeeds
• - Pull request has been squashed into 1 commit
• - I did NOT commit changes to dist/
• - Code coverage does not decrease (if any source code was changed)
• - Appropriate JSDoc comments were updated in source code (if applicable)
• - Approprate changes to js-data.io docs have been suggested ("Suggest Edits" button)