Handle gpg signing better (#1123)

Instead of checking whether it was set previously, setting it to false,
then setting it back to true if it was true before, just use the
command-line argument in git to override the config for that command.
Using a variable makes it pretty painless to do.

scripts/functions.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+gitcmd="git -c commit.gpgsign=false"
+
 color() {
     if [ $2 ]; then
             echo -e "\e[$1;$2m"
@@ -12,11 +14,11 @@ colorend() {
 }
 
 paperstash() {
-    STASHED=$(git stash  2>/dev/null|| return 0) # errors are ok
+    STASHED=$($gitcmd stash  2>/dev/null|| return 0) # errors are ok
 }
 
 paperunstash() {
     if [[ "$STASHED" != "No local changes to save" ]] ; then
-        git stash pop 2>/dev/null|| return 0 # errors are ok
+        $gitcmd stash pop 2>/dev/null|| return 0 # errors are ok
     fi
 }