Revise python mode and related packages

* Revise python mode by using use-package
Disable ido-ubiquitous temporarily

Disable ido-ubiquitous until this issue is fixed.
https://github.com/DarwinAwardWinner/ido-ubiquitous/issues/24
Replace flymake by flycheck
Diminish paredit-everywhere-mode
Add package `smartparens'

* Remove electric-pair-mode
* Remove show-paren-mode
Add package `yasnippet'
Add keybindings in lisp-interaction-mode-map
Add two keybindings to open new line easily