use both language and name, or only language

``` src blocks in Octopress support language and name, or only
language, but not only name
use {% codeblock %} style blocks if there is no language specified

I was running into this problem
https://github.com/imathis/octopress/issues/1342 an awful lot, and it
was happening in really wonky scenarios that seemed to be dependent on
the number of code blocks in a file (?!!)

Using these other code block delimeters for blocks without a language
specified seems to skip the syntax highlighting code path
removed my own blog source from the tree
added to the readme