css not cleared from previous layoutView

[bojanv55]

I'm submitting a bug report

• Library Version:
  0.31.3

Please tell us about your environment:

• Operating System:
  Windows 7

• Node Version:
  6.11.4

• NPM Version:
  3.10.10

• Aurelia CLI OR JSPM OR Webpack AND Version
  CLI 0.31.3

• Browser:
  all

• Language:
  all

Current behavior:
when switching layoutView, previous css is not removed

Expected/desired behavior:
css should be removed

• What is the motivation / use case for changing the behavior?

this can be tested on this project (after logging in, among other things, bacground color #cccccc should be replaced). On page refresh all is OK (new color from other css kicks in).

https://github.com/bojanv55/aurelia-in-action

[AshleyGrant]

This is a known bug in our CSS implementation. @jdanyow we really need to solve this as well as making sure CSS files are included in the order they are required, not in the order they download.