BUGFIX: Content-Type, Nil Raw Body Edge Case, Links

FIXES:
* There was an edge case where a raw body for HTML would potentially
  result in a nil byte slice exception. This has been fixed.
  (I don't even know if it was possible, I just made sure it wasn't.)
* The links browser is now explicitly returned as HTML and properly
  detected as a "browser".
* Hyperlinks for links, w3m added to Usage page.
* Content-Type is now always set correctly; there were cases where it
  was improperly returning e.g. text/plain for JSON.

README.adoc

@@ -0,0 +1,20 @@
+= ClientInfo
+r00t^2 <brent.saner@gmail.com>
+Last rendered {localdatetime}
+:doctype: book
+:docinfo: shared
+:data-uri:
+:imagesdir: images
+:sectlinks:
+:sectnums:
+:sectnumlevels: 7
+:toc: preamble
+:toc2: left
+:idprefix:
+:toclevels: 7
+//:toclevels: 4
+:source-highlighter: rouge
+:docinfo: shared
+
+== DOCS
+**TODO!**