adding new color list as an extra color. create an extra color for buttons.

Signed-off-by: Bravocado <bravocado.project@gmail.com>
bug fixes. droping some vendor prefixes.

Signed-off-by: Bravocado <bravocado.project@gmail.com>
[improvement] themes mixin.
[improvement] conditional vars.
[fix] conditional themes bug.
[improvement] based on Tama feedback "pretty" class name change to "candy".
[debug] compatibility test using sass 3.3.0.rc.5.

Signed-off-by: Bravocado <bravocado.project@gmail.com>