Add :set nohistory option

Issue type:

• Feature request

Description:

Vimperator always creating folder vimeprator and file history-commands and others in private browsing mode, where is history supposed to be cleaned when you close your browser, but vimperator keep it.

Expected behavior:

Add options nohistory or somthing like that, so Vimperator cannot keep history, or make sure history clearing when you close browser in private mode.

[timss]

Good idea.