Update color of compose button to match material design palette.
Update color of compose button to match material design palette.

jlhughes/foam,mdittmer/foam,foam-framework/foam,foam-framework/foam,jacksonic/foam,jacksonic/foam,foam-framework/foam,osric-the-knight/foam,mdittmer/foam,jlhughes/foam,jacksonic/foam,jacksonic/foam,foam-framework/foam,osric-the-knight/foam,foam-framework/foam,osric-the-knight/foam,jlhughes/foam,jlhughes/foam,osric-the-knight/foam,mdittmer/foam,mdittmer/foam