support undotree, gundo, nerdtree, tagbar
use list of funcrecs, allowing window overrides to be dynamically added
refactor beowolf theme
Revert "use list of funcrecs, allowing window overrides to be dynamically added"

This reverts commit c0427e435d2eb2170517438ddd4f0b5fa7a8b691.
Merge pull request #47 from unc0/master

Refactor badwolf theme, fix replace/paste mode color.
add info about double-width characters. resolves #9.
add contribution guidelines to the readme