Use textobj-user's "next" mechanism for next/prev function/class

This could also use functions, and define `move-P` and `move-N`
additionally, for "jump to end".
Call textobj#user#plugin always
Setup buffer-local mappings
Merge branch 'blueyed-use-textobj-move'. Closes #7.

Conflicts:
	after/ftplugin/python/textobj-python.vim