LMW-117 Don’t use background image to keep customized background color
LMW-117 Renamed method
LMW-117 Use set style method when possible
LMW-117 Remove image doesn’t used anymore
LMW-117 Fix broken build: remove missing image
Merge pull request #68 from liferay/LMW-117-change-button-color

LMW-117 The default theme should allow child themes to set custom background color of buttons