changed keymap in vim normal mode to passthrough ctrl-d and remap :editor.doc.toggle to pmeta-d
Merge pull request #35 from JobJob/two-char-esc

Enables setting two character shortcuts (e.g. jk) to exit insert mode
Pluralize behavior since it takes multiple options
Merge branch 'pr/19'

Conflicts:
	vim.keymap
Change editor.doc.toggle to K since ctrl-d and pmeta-d are the same on non-macs
Mention current version since it's not explicitly in vim.js file