Fix #356 - Add .dark variant for color
Merge master
Merge pull request #412 from ebollens/feature/356

Fix #356 - Add .dark variant for color
#411 - Add .dark, .fade, .emphasize and core adapter support
#411 - Update documentation with changes from 0ccb8ea
#411 - Partial fix to bootstrap adapter for dark colors
Fix #411 - Complete fix to bootstrap adapter for dark colors
Merge pull request #414 from ebollens/feature/411

Fix #411 - Add .dark, .fade, .emphasize and dark background support