Add support for OpenBSD, and also add some regression tests.

Add info about OpenBSD support to README.md and metadata.json
Add a note about OpenBSD java_version fact to README.markdown.
Fixup wording on context in one of the java patch level regression tests.
No mentioning of OpenBSD in metdata.json

Cleanup wording of context as suggested by @elyscape
update contexts as suggested by @elyscape

manifests/params.pp

@@ -127,6 +127,12 @@ class java::params {
         }
       }
     }
+    'OpenBSD': {
+      $java = {
+        'jdk' => { 'package' => 'jdk', },
+        'jre' => { 'package' => 'jre', },
+      }
+    }
     'Solaris': {
       $java = {
         'jdk' => { 'package' => 'developer/java/jdk-7', },