Do not show progess bar on npm install on CI

See https://github.com/npm/npm/issues/11283 for more discussion on this.

appveyor.yml

@@ -83,5 +83,5 @@ test_script:
   - build\\rippled --unittest
 
   # Run the integration tests
-  - npm install
+  - npm install --progress=false
   - npm test

bin/ci/ubuntu/build-and-test.sh

@@ -37,5 +37,5 @@ else
 fi
 
 # Run NPM tests
-npm install
+npm install --progress=false
 npm test --rippled=$RIPPLED_PATH

circle.yml

@@ -30,7 +30,7 @@ test:
     # gdb segfaults
     # - cat script.gdb | gdb --ex 'set print thread-events off' --return-child-result --args build/clang.debug/rippled --unittest
     - build/clang.debug/rippled --unittest
-    - npm install
+    - npm install --progress=false
     # Use build/(gcc|clang).debug/rippled
     - |
       echo "exports.default_server_config = {\"rippled_path\" : \"$HOME/rippled/build/clang.debug/rippled\"};" > test/config.js