Updating copyright to make it more clear

Slava Akhmechet · Slava Akhmechet · commit bc9b2f744128 · 2012-10-30T00:09:27.000-07:00
diff --git a/COPYRIGHT b/COPYRIGHT
@@ -1,4 +1,4 @@
-RethinkDB Engine
+RethinkDB Database System
 
 Copyright 2010-2012, RethinkDB, portions copyright Google and others and used with permission or subject to their respective license agreements.
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-RethinkDB Engine`
	`1`	`+RethinkDB Database System`
`2`	`2`
`3`	`3`	`Copyright 2010-2012, RethinkDB, portions copyright Google and others and used with permission or subject to their respective license agreements.`
`4`	`4`