Merge pull request #1595 from SynBioHub/fixAttachments

Change to use mkdirp rather than mkdirp-promise

lib/uploads.js

@@ -4,7 +4,7 @@ const fs = require('mz/fs')
 const zlib = require('zlib')
 const shastream = require('sha1-stream')
 const filetype = require('file-type')
-const mkdirp = require('mkdirp-promise')
+const mkdirp = require('mkdirp')
 const assert = require('assert')
 const streamMeter = require('stream-meter')
 const stream = require('stream')