Merge branch 'develop' of github.com:xerial/silk into develop

Author: xerial

README.md

@@ -1,7 +1,7 @@
-
 Silk is a universal data model for describing relations, trees and their
 streams. Silk Weaver is an open-source parallel/distributed DBMS for Silk
 data, written in Scala. 
 
 For the details of Silk, visit http://xerial.org/silk
 
+Contributor: Hayato Sakata