1.0.0: Add sync API and update async API to pass error to callback as the first argument.

CHANGELOG.md

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+
+# Change Log
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [1.0.0] 2015-08-27
+
+### New Features
+
+ - New sync API was added. Like crypto.getRandomBytes(), it can throw an exception if the system 
+   is short on entropy. (#1, @markstos)
+
+### Breaking changes
+
+- Async API now follows the Node.js convention of returning an error as the first argument
+  to the callback. The error might be populated if the system runs out of entropy. (#2, @markstos)