E2E npm registry proxy & truffle smoke-tests (#2)

Author: cgewecke

.travis.yml

@@ -2,6 +2,7 @@ services:
     - xvfb
 language: node_js
 matrix:
+  fast_finish: true
   include:
     - node_js: 8
       env: TEST=unit
@@ -13,11 +14,17 @@ matrix:
       env: TEST=build_and_lint
     - node_js: 10
       env: TEST=unit_and_e2e_clients
+    - node_js: 10
+      env: TEST=e2e_truffle
     - node_js: 10
       env: TEST=e2e_browsers
       addons:
         chrome: stable
         firefox: latest
+  allow_failures:
+    - node_js: 10
+      env: TEST=e2e_truffle
+
 addons:
   apt:
     sources: