Add RequireJS and RequireJS Optimizer configuration to the LMS

Respond to review comments:

- Rename build and config files for consistency between lms/studio.
- Fix merge conflicts with lms require config.
- Devstack uses optimized pipeline to skip require JS optimizer step
- Add tests for render_require_js_path_overrides

cms/envs/devstack.py

@@ -30,6 +30,11 @@ EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
 LMS_BASE = "localhost:8000"
 FEATURES['PREVIEW_LMS_BASE'] = "preview." + LMS_BASE
 
+########################### PIPELINE #################################
+
+# Skip RequireJS optimizer in development
+STATICFILES_STORAGE = 'pipeline.storage.PipelineCachedStorage'
+
 ############################# ADVANCED COMPONENTS #############################
 
 # Make it easier to test advanced components in local dev