fix(app): fix Bootstrap font issues

Fix handling of Bootstrap fonts. This correctly loads the fonts in
`grunt serve` as well as `grunt serve:dist`. This should hopefully close
all the PR's and issues related to Bootstrap fonts.

Also removes styles being duplicated in a the output CSS file.

This includes a potentially breaking change in that `root` of **cssmin**
has been reverted (removed).

Closes #552
Fixes #638
Fixes #645
Closes #661
Fixes #662
Partially closes #664
Fixes #665
Fixes #667