Create Appveyor artifacts

appveyor.yml

@@ -19,7 +19,7 @@ environment:
   APPVEYOR_RDP_PASSWORD: "RedRum666!"
 
 artifacts:
-  - path: "APBS*.zip"
+  - path: '**\APBS*.zip'
     name: APBS.zip
 
 matrix:

externals/update_externals.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+for external_dep in bem fetk geoflow_c pb_s_am
+do
+  echo cd $external_dep
+  cd $external_dep
+  echo 'git checkout master && git pull'
+  git checkout master && git pull
+  echo cd ..
+  cd ..
+  echo git add $external_dep
+  git add $external_dep
+done
+
+echo "git commit -m 'updating submodule to latest'"
+git commit -m "updating submodule to latest"