fix(build): Adding file paths for proxies. (#5853)

* fix(build): Excluding css file from karma test.

Getting rid of 404 errors by excluding the css file from the karma test.

* fix(build): Adding proxis to karma.conf.js

Ensuring font files don't return a 404 during karma tests.

* fix(build): Adding file paths for proxies.

Trying to prevent socket hang up errors.

Author: mportuga

test/karma.conf.js

@@ -30,6 +30,7 @@ module.exports = function(config) {
       'src/features/**/test/**/*.spec.js',
 
       'dist/release/ui-grid.css',
+      'src/font/*',
 
       '.tmp/template.js' // templates
     ],