Revert "Apply bcolor attribute even if using shorthand css values definitions"

This reverts commit c6cc2e51e46a0679445f0c931da2dd4ac0b9bbc6.
Revert "Add support to use premailer as fully command line program"

This reverts commit 3d0e4398e80e43d1d304f19ad82739b47c58fa4b.