Only have network connectivity when explicitly asked for feature branches. This action is so common that it should be quick (very git-ish).

For hotfix and release branches, forgetting to update would be an unsafe thing to do, so we leave the fetch in there by default.
diff --git a/git-flow-feature b/git-flow-feature
index 2a3e39d..4a25a81 100644
--- a/git-flow-feature
+++ b/git-flow-feature
@@ -13,6 +13,7 @@
 #
 
 PREFIX=$(git config --get gitflow.prefix.feature || echo feature/)
+FLAG_FETCH=0
 
 usage() {
 	echo "usage: git flow feature [list]"
@@ -55,6 +56,8 @@
 }
 
 parse_args() {
+	# TODO: When we have a nice structured way of parsing flags with getopt,
+	# implement the --fetch flag, to set FLAG_FETCH=1
 	NAME="$1"
 	BASE="${2:-$DEVELOP_BRANCH}"
 	if [ "$NAME" = "" ]; then
@@ -71,11 +74,14 @@
 	# sanity checks
 	gitflow_require_clean_working_tree
 	gitflow_require_branch_absent $BRANCH
-	if [ "$BASE" = "$DEVELOP_BRANCH" ]; then
+
+	# update the local repo with remote changes, if asked
+	if [ $FLAG_FETCH -eq 1 ]; then
 		git fetch -q $ORIGIN $DEVELOP_BRANCH
-		gitflow_require_branches_equal $DEVELOP_BRANCH $ORIGIN/$DEVELOP_BRANCH
 	fi
 
+	gitflow_require_branches_equal $DEVELOP_BRANCH $ORIGIN/$DEVELOP_BRANCH
+
 	# create branch
 	git checkout -b $BRANCH $BASE
 
@@ -96,7 +102,12 @@
 	# sanity checks
 	gitflow_require_clean_working_tree
 	gitflow_require_branch $BRANCH
-	git fetch -q $ORIGIN
+
+	# update local repo with remote changes first, if asked
+	if [ $FLAG_FETCH -eq 1 ]; then
+		git fetch -q $ORIGIN $BRANCH
+	fi
+
 	if has $ORIGIN/$BRANCH $REMOTE_BRANCHES; then
 		gitflow_require_branches_equal $BRANCH $ORIGIN/$BRANCH
 	fi