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* Extensive documentation rewrite.
* Added Mapper.extend function that allows one to add lists of Routes objects
to the mapper in one batch, optionally with a path_prefix.
* Added Mapper.submapper function that returns a SubMapper object to enable
easier declaration of routes that have multiple keyword argument options
in common.
* Mapper controller_scan argument now handles None, and lists of controller
names in addition to a callable.
* Route object now takes a name parameter, which is the name it responds to.
This name is automatically added when called by using Mapper's connect
class method.
* Added optional LRU object for use with Routes when URL's change too often
for the Routes urlcache dict to be a viable option.