Merge branch 'release/3.0.0.2' into develop

* release/3.0.0.2:
  Bump version to 3.0.0.2
Integrate changes up to twbs/bootstrap@f811c1b56cb109394268ec66cf3f956f987e5884
Merge branch 'hotfix/v3.0.0.3' into develop

* hotfix/v3.0.0.3:
  Bump version to 3.0.0.3
  Fixed issue in 'img-retina' mixin where 'file-1x' and 'file-2x' variables weren't being properly expanded due to enclosing quotes.
Update to twbs 3.0.1
Cleanup _mixins.scss
Bump minimum calculation precision
Bump version to 3.0.1.0
Merge branch 'release/3.0.1.0'

* release/3.0.1.0:
  Bump version to 3.0.1.0
  Bump minimum calculation precision
  Cleanup _mixins.scss
  Update to twbs 3.0.1
  Integrate changes up to twbs/bootstrap@f811c1b56cb109394268ec66cf3f956f987e5884