Merge pull request #117 from victorz/master

Fix grammar in book.json.

book.json

 {
-    "title": "The Redox Operating-System",
-    "description": "This books carefully describes the design, implementation, direction, and structure of Redox, the operating-system.",
+    "title": "The Redox Operating System",
+    "description": "This book carefully describes the design, implementation, direction, and structure of Redox, the operating system.",
     "author": "Ticki"
 }