Implement `success` keyword

Related to #4
Add docs
Checking in changes prior to tagging of version 0.11.

Changelog diff is:

diff --git a/Changes b/Changes
index e1ef77b..768ee16 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Test-Synopsis-Expectation

 {{$NEXT}}

+0.11 2014-01-02T17:03:39Z
+
+    - Add `success` notation
+
 0.10 2013-12-31T08:25:12Z

     - Add notations to ignore testing