backlog(1.0): 添加update方法

提供git toolkit update来直接更新本工具集

installer.sh

@@ -51,7 +51,7 @@ function uninstall() {
 
 # 使用帮助
 function help() {
-    echo "Usage: [environment] $REPO_NAME installer.sh [install|uninstall]"
+    echo "Usage: [environment] $REPO_NAME installer.sh [install|uninstall|update]"
     echo "Environment:"
     echo "   COMMAND_PATH_PREFIX=$COMMAND_PATH_PREFIX"
     echo "   INSTALL_PATH=$INSTALL_PATH"
@@ -66,6 +66,11 @@ function install() {
     install_hooks
 }
 
+function update() {
+    echo "Update $REPO_NAME"
+    install
+}
+
 # clone项目
 function clone() {
     if [ -d "$INSTALL_PATH" -a -d "$INSTALL_PATH/.git" ] ; then
@@ -114,6 +119,10 @@ case $1 in
         uninstall
 		exit
         ;;
+    update)
+        update
+        exit
+        ;;
     help)
         help
         exit