Change git flow {bugfix,feature,hotfix} rename argument order to [<old_name>] <new_name>, following git conventions (like git branch --move [<oldbranch>] <newbranch>)

Author: bmcdonnell

git-flow-bugfix

@@ -832,7 +832,7 @@ r,[no]remote     Delete remote branch
 
 cmd_rename() {
 	OPTIONS_SPEC="\
-git flow bugfix rename <new_name> [<old_name>]
+git flow bugfix rename [<old_name>] <new_name>
 
 Rename a given bugfix branch
 --

git-flow-feature

@@ -833,7 +833,7 @@ r,[no]remote     Delete remote branch
 
 cmd_rename() {
 	OPTIONS_SPEC="\
-git flow feature rename <new_name> [<old_name>]
+git flow feature rename [<old_name>] <new_name>
 
 Rename a given feature branch
 --

git-flow-hotfix

@@ -735,7 +735,7 @@ r,[no]remote          Delete remote branch
 
 cmd_rename() {
 	OPTIONS_SPEC="\
-git flow hotfix rename <new_name> [<old_name>]
+git flow hotfix rename [<old_name>] <new_name>
 
 Rename a given hotfix branch
 --

gitflow-common

@@ -609,15 +609,17 @@ gitflow_rename_branch() {
 	# read arguments into global variables
 	if [ -z $1 ]; then
 		NEW_NAME=''
-	else
-		NEW_NAME=$1
-	fi
-
-	if [ -z $2 ]; then
 		NAME=''
 	else
-		NAME=$2
+		if [ -z $2 ]; then
+			NAME=''
+			NEW_NAME=$1
+		else
+			NAME=$1
+			NEW_NAME=$2
+		fi
 	fi
+
 	BRANCH=${PREFIX}${NAME}
 	NEW_BRANCH=${PREFIX}${NEW_NAME}