Back to inoremap from iabbrev for easy to use
Rename <Return> to <CR>
Disallow up, right, left and down key

* at normal mode and insert mode
* map to <Nop> until find something good other mapping
Change scheme quickrun command to gosh

* Remove slimv from scheme filetype
* Pending MIT-Scheme, Use Gauche
Disable quickrun time enable option
Change keymap for insert date