Make configuration variables follow conventions.

[jordwalke]

Vim plugins are usually:

• In git repos like vim-myplugin (seldom uses hyphens in the portion after vim-).
• Have plugin files like plugin/myplugin.vimand autoload functions like myplugin#foo.
• Have configuration settings like g:myplugin_settingName.

Right now setting config names for vim-reason are g:vimreason.