Add agents that they can spider dynamic content

[kltm]

Currently, tanuki can only interact with static content. An agent should be added that can access dynamic JS content (maybe waiting a few seconds before processing or waiting for connection quiescence).

Since there don't seem to be many native methods for this, possibilities include:

• wait for a native implementation of something (maybe webapi)
• get the stack to run on abcl, then use selenium/phanomjs bindings more-or-less directly
• pass through to an intermediate agent that can deal with this
• compile down the code via parenscript to run phantomjs/etc natively (would require a better abstraction layer over the db)

[kltm]

Actually, there may be a way through this with Electron as well? https://news.ycombinator.com/item?id=9877314