Add Colin's design notes.

design.md

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+# Webextension modules we might need:
+
+* keyboard (not yet existent)
+* storage (.vimperatorrc)
+* tabs
+* history (for auto completion of open, etc)
+* bookmarks (auto completion, obvious)
+* windows (buffers)
+* webNavigation (autocmds) - maybe content script would just do this for us.
+
+## Stuff we want to do that I know how to do:
+
+Show hints:
+	For each link in viewport (how to restrict to viewport?):
+		Add a <p> element styled to appear on top of it
+		Listen for keystrokes.
+	Does vimperator just go for <a> tags? I think it probably knows about elements that can be clicked for other effects.
+Change tab
+	tabs.update(tabtodisplay, {active: true})
+Change window focus
+	windows.update(windowtofocus, {focused: true})
+
+## Stuff I don't know how to do:
+
+Use promises properly.
+Use promises from a sane language (coffeescript, livescript, elm, etc).
+Find promises to cancel their chain.
+Communication between background and content scripts.