Add jedi#reinit_python
Add jedi#reinit_python

This is meant to be used in case you want to re-init the Python version
used by jedi-vim, without restarting Vim.

I had this laying around.. it might be better to just export
`s:init_python` as `jedi#init_python`?!

genzj/jedi-vim,itchyny/jedi-vim,FBruynbroeck/jedi-vim,davidhalter/jedi-vim,wilywampa/jedi-vim,pze/jedi-vim