enable only in command mode

[ri-aje]

hi, can you add a variable to control this rsi feature only works in command line mode, i.e., give an option to disable it in insert mode? thanks.

[hupfdule]

Actually, please provide both, disabling in insert mode and disabling in commandline mode.

This would also fix #41, since the described problem only exists in commandline mode.
It would be possible then to user vim-rsi for insert mode and readline.vim for commandline mode.

[tpope]

You can do inoremap <C-A> <C-A> now to preserve any built-in and prevent RSI from mapping it. This solves the readline.vim use case too.

[tpope]

I confused myself, meant to say that's how I want it implemented, as I elaborate on in #48.