Add 'bash' language syntax highlighting

Closes gh-47

Author: philwebb

src/main/js/site/highlight.js

@@ -37,6 +37,7 @@
   highlightJs.registerLanguage('ruby', require('highlight.js/lib/languages/ruby'));
   highlightJs.registerLanguage('scala', require('highlight.js/lib/languages/scala'));
   highlightJs.registerLanguage('shell', require('highlight.js/lib/languages/shell'));
+  highlightJs.registerLanguage('bash', require('highlight.js/lib/languages/shell'));
   highlightJs.registerLanguage('sql', require('highlight.js/lib/languages/sql'));
   highlightJs.registerLanguage('xml', require('highlight.js/lib/languages/xml'));
   highlightJs.registerLanguage('yaml', require('highlight.js/lib/languages/yaml'));

src/test/asciidoc/standard.adoc

@@ -313,6 +313,20 @@ Content-Length: 121
 }
 ----
 
+Here's some shell:
+
+[source,shell]
+----
+$ cat thefile.txt
+----
+
+Which can also be referenced as `bash`:
+
+[source,bash]
+----
+$ cat thefile.txt
+----
+
 
 
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