chore(tests): implement e2e test harness outside of docs app

Included:

- A sample test fixture
- A sample test
- Server middleware to serve the E2E harness
- Convenient test helpers to simplify loading the right fixture

Closes #9557
Closes #9527

scripts/travis/build.sh

@@ -11,10 +11,16 @@ if [ $JOB = "unit" ]; then
   grunt tests:docs --browsers SL_Chrome,SL_Safari,SL_Firefox,SL_IE_9,SL_IE_10,SL_IE_11 --reporters dots
   grunt test:travis-protractor --specs "docs/app/e2e/**/*.scenario.js"
 elif [ $JOB = "e2e" ]; then
+  if [ $TEST_TARGET = "jquery" ]; then
+    export USE_JQUERY=1
+  fi
+
   export TARGET_SPECS="build/docs/ptore2e/**/default_test.js"
   if [ $TEST_TARGET = "jquery" ]; then
     TARGET_SPECS="build/docs/ptore2e/**/jquery_test.js"
   fi
+
+  export TARGET_SPECS="test/e2e/tests/**/*.js,$TARGET_SPECS"
   grunt test:travis-protractor --specs "$TARGET_SPECS"
 else
   echo "Unknown job type. Please set JOB=unit or JOB=e2e-*."