Do force update of npm

Do a force update of npm when it is outdated. Addresses issue - npm/cli#611

Author: dkav

Node/npm_update.sh

@@ -14,7 +14,12 @@ if [ -x "$(command -v npm)" ]; then
             pver="$(cut -d@ -f2 <<<"$npkg")"
             pkg="$(cut -d@ -f1 <<<"$npkg")"
             echo "Updating $pkg ($cver-->$pver)"
-            npm install --global --no-progress --quiet $npkg 1>/dev/null
+            if [[ $npkg =~ "npm" ]]; then
+                npm install --force --global --no-progress --quiet \
+                    $npkg 1>/dev/null
+            else
+                npm install --global --no-progress --quiet $npkg 1>/dev/null
+            fi
         done
     else
         echo "No packages to update"