Removing html5shiv for not complying with its own licenses and racism

Removing html5shiv for not complying with its own licenses and racism

Issues of racism seem to have been resolved and removed from upstream,
but make having this as a dependency somewhat uncomfortable:
  https://github.com/aFarkas/html5shiv/issues/91

Regardless, at the time of writing the project doesn't comply with its
own license... it states to be dual licensed under MIT and GPLv2 but
distributes neither of these licenses with its source.