Merge branch 'fix/gulpsftp' into 'develop'

Fix/gulpsftp【更新gulp-sftp依赖包支持sftp上传】

See merge request o2oa/o2oa!406

o2web/gulpfile.js

@@ -7,7 +7,7 @@ var gulp = require('gulp'),
     gulpif = require('gulp-if'),
     minimist = require('minimist'),
     ftp = require('gulp-ftp'),
-    sftp = require('gulp-sftp'),
+    sftp = require('gulp-sftp-up4'),
     JSFtp = require('jsftp'),
     gutil = require('gulp-util'),
     fs = require("fs");