Add comments to houdini.h
Ability to render all HTML text with Houdini-style arraylookups
Render text and tag attributes using the arraylookup-based methods
Images: Bugfix: Should use constant from VfmdConstants
HtmlTextRenderer: Remove unused code
Automatic links: Split bracketed and unbracketed handling

Bracketed: Like <http://example.net>
Unbracketed: Like http://example.net

Having two separate handlers makes it easier to handle
edge cases (like an unclosed '<' followed by a link).
Automatic links: Fix handling of mailto: links
VfmdByteArray: replaced() to replace bytes with strings
Change the VfmdDocument and VfmdPreprocessor interface

Instead of adding input bytes in multiple calls, all the input
is passed as a single bytearray. This reduces the amount of
copying, especially in the case when the input is valid UTF-8 and has
no tabs.