Use Pipfile on setup

Travis CI environment apparently now has pipenv installed (by default) in the Python environments.  The CI environment (linux container) doesn't match local development environment (macOS).  Ignore Pipfile.lock and install dependencies from Pipfile to fix CI setup errors.

Author: cmlccie

script/installdeps

@@ -16,7 +16,7 @@ export PIP_REQUIRE_VIRTUALENV=true
 # Prefer use of a Pipfile and pipenv for dependency management
 if [[ -f "Pipfile" ]] && [[ -n "$(pipenv --version 2>/dev/null)" ]]; then
     echo "==> Installing Pipfile dependencies"
-    pipenv install --dev
+    pipenv install --dev --skip-lock
 
 elif [[ -f "requirements.txt" ]]; then
     echo "==> Installing requirements.txt dependencies"