Relinking to exhibit via symlink.
link -> script
link->script
link->script
no bundle
api link is necessary for demos
Fixed marker cache to handle asynchronous arrivals to disposed maps.
Because icon generation is now asynchronous, it's possible for an icon
to arrive after the map that wants it, and its cache, has been
disposed.  Which caused a write into a nonexistent cache.  Instead, we
now ignore the request.

Presidents exhibit was broken.  The auto-position option wasn't
working.  Investigation suggests it hasn't been working for a very
long time---there's a 2 year old bug in the code.  For now, I've
removed use of that option.
Corrected map autoposition functionality and use of max-auto-zoom param.
The idea behind autoposition is that exhibit should render the map at
a position and zoom that is suitable for the rendered items.  A max-auto-zoom
parameter was defined to limit how zoomed in this auto-positioning could
be.  However, it was defined as a *per-item* parameter: in other words,
you would specify a max-auto-zoom for each item by specifying an exhibit
expression defining it.  This seems like overkill; it's unlikely that an
author would go to the trouble of defining such a parameter per point.
Also, the code wasn't working.  I've replaced it with a global parameter,
and made it work.
Added proper handling of map autoposition and max-auto-zoom parameters
and demonstration of same in presidents exhibit
Fixed map extension to use gmaps loaded callback instead of polling.
Lets us load map extension faster.
fix typo in Image formatter (tootlip->tooltip)
fix URL formatting

All 'a' tags in the document were being selected, modified, then moved by the appender. Fixed it so that a new tag is created and appended, as expected.
Merge pull request #66 from karger/2013-11-08_presidents

Presidents exhibit was broken.  The auto-position option wasn't working.
Merge pull request #67 from karger/2013-11-13_maps

Fixed map extension to use gmaps loaded callback instead of polling.
Merge pull request #68 from dfeeney/master

Bug fixes in the image and URL formatters