Merge pull request OpenBazaar#1073 from Jchase2/arch_ask_user_update

Asking user if we should upgrade on arch install.

configure.sh

@@ -133,7 +133,13 @@ function installArch {
   #print commands
   set -x
 
-  sudo pacman -Sy
+  echo "Some packages and dependencies may fail to install if your package list is out of date."
+  echo "Would you like to upgrade your system now? "
+  if confirm ; then
+    sudo pacman -Syu
+  else
+    echo "Continuing."
+  fi 
   # sudo pacman -S --needed base-devel
   # Can conflict with multilib packages. Uncomment this line if you don't already have base-devel installed
   sudo pacman -S --needed python2 python2-pip python2-virtualenv python2-pyzmq rng-tools libjpeg sqlite3 openssl
@@ -150,10 +156,10 @@ function installArch {
 function confirm {
     # call with a prompt string or use a default Y
     read -r -p "Are you sure? [Y/n] " response
-    if [[ $response =~ [nN](o)* ]]; then
-      return 1
-    else
+    if [[ $response =~ ^([yY][eE][sS]|[yY])$ ]]; then
       return 0
+    else
+      return 1
     fi
 }