* Add new Developer Examples page
* Add a transaction tutorial describing in detail how to make various
different transactions.
* Add a new "multicode" CSS class to allow combination of consecutive
code blocks into a single code block. This lets us use pygments
highlighting for multiple different types of code within the same
aparent block of code.
* Get autocrossref to ignore code blocks so we don't need to endcrossref
every time we encounter a code block. This makes the source much more
readable and maintainable.