spec: bump karma browser timeout, add realtime output in js:test

refs SD-1060

if a jenkins node is overloaded or has too few cores, tests can abort
before starting. sometimes it takes more than 10 seconds for requirejs
to load :allthethings: 😭

Change-Id: I72f3c39abb65a06524bbb981a8fdd8a7cbbac568
Reviewed-on: https://gerrit.instructure.com/81659
Reviewed-by: Clay Diffrient <cdiffrient@instructure.com>
Tested-by: Jenkins
Product-Review: Jon Jensen <jon@instructure.com>
QA-Review: Jon Jensen <jon@instructure.com>

karma.conf.js

@@ -79,6 +79,8 @@ var karmaConfig = {
   // If browser does not capture in given timeout [ms], kill it
   captureTimeout: 60000,
 
+  browserNoActivityTimeout: 20000,
+
   // Continuous Integration mode
   // if true, it capture browsers, run tests and exit
   singleRun: false

lib/tasks/js.rake

@@ -129,8 +129,7 @@ namespace :js do
         end
         puts "--> executing browser tests with Karma"
         build_runner
-        karma_output = `./node_modules/karma/bin/karma start --browsers Chrome --single-run --reporters progress,#{reporter} 2>&1`
-        puts karma_output
+        system "./node_modules/karma/bin/karma start --browsers Chrome --single-run --reporters progress,#{reporter}"
 
         if $?.exitstatus != 0
           puts 'some specs failed'
@@ -367,14 +366,4 @@ namespace :js do
       EmberBundle.new(app).build
     end
   end
-
-  #def npm_run(command)
-    #puts "Running npm script `#{command}`"
-    #msg = `$(npm bin)/#{command} 2>&1`
-    #unless $?.success?
-      #raise msg
-    #end
-    #msg
-  #end
-
 end