set --trust-model=always when encrypting

Otherwise gpg may prompt to verify if we want to encrypt to users who
do not have a defined trust level. But, the participants setting
explicitly listed them, so we know we want to encrypt to them.

closes #3

git-remote-gcrypt

@@ -313,7 +313,7 @@ CLEAN_FINAL()
 
 ENCRYPT()
 {
-	gpg --batch --force-mdc --compress-algo none --passphrase-fd 3 -c 3<<EOF
+	gpg --batch --force-mdc --compress-algo none --trust-model=always --passphrase-fd 3 -c 3<<EOF
 $1
 EOF
 }
@@ -333,7 +333,7 @@ PRIVENCRYPT()
 	if isnonnull "$Conf_signkey"; then
 		set -- "$@" -u "$Conf_signkey"
 	fi
-	gpg --compress-algo none -se "$@"
+	gpg --compress-algo none --trust-model=always -se "$@"
 }
 
 # $1 is the match for good signature, $2 is the textual signers list