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Unlike the Web API, we don't reject connections.  Instead, we try hard
to serve them all, even though some may be delayed.

That allows us to cache bridge lines of connections that were still open
while we received the signal to shut down.

We are GETting rather than POSTing something, and "bridge-state" is a
more descriptive resource name.

This patch also merges our Web interface and our API handlers, making
the code simpler.

This makes our API naming convention consistent with wolpertinger.

Our cache will contain hundreds of bridges.  Testing all these bridges
again after bridgestrap quits for whatever reason is expensive.  This
patch makes bridgestrap write its cache to disk when it exists, and
read it from disk when it starts, so we don't have to re-build our cache
after a restart.

The new flag '-cache' specifies the path to our cache.

Port 4000 is already taken on BridgeDB.

This commit adds the '-web' parameter, which now must be used to enable
the web interface.  By default, only the JSON API is enabled.