Trim inline code. Fixes #69.

The inline code regex itself could also simply have \s* prepended
and appended to outside the main capture. However, this results
in less accurate behavior.

lib/marked.js

@@ -637,7 +637,7 @@ InlineLexer.prototype.output = function(src) {
     if (cap = this.rules.code.exec(src)) {
       src = src.substring(cap[0].length);
       out += '<code>'
-        + escape(cap[2], true)
+        + escape(cap[2].trim(), true)
         + '</code>';
       continue;
     }