version bump
add namespaces
add namespace docs
add docstring examples in dispatch

1. Dispatch on instance methods
2. Isolated namespaces
clean up docstring
Remove supported_types property.  Unused.
remove xfail import
Move dispatcher objects to separate file
add extend method to Dispatcher

Serves as singledispatch style decorator
Rename Dispatcher.extend to register

This is similar to Py3.4 functools.singledispatch
add design doc
reword docs/design.md
reword docs/design.md
test MethodDispatcher.register
minor edits to docs/design
add badges to README
fix typo in badges
run coveralls after success
clean up readme text
fix typos in design.md