Use local patched version of emacs-jedi

https://github.com/tkf/emacs-jedi/pull/118
Bind M-. and M-, to jedi:goto-definition and jedi:goto-definition-pop-marker
Use more chord keys
Disable flx-ido

C-k doesn't work: https://github.com/lewang/flx/issues/46
Ido often suggests completing a choise different from flx suggestion
Disable git-gutter

I had some issues with it
Use S-RET and M-RET in Magit to visit item in other window

M-RET should switch to other window, but S-RET should not.
Rebind Escape to be a keyboard macro for <C-g>

I hope it will work the same way as <C-g> in all circumstances