message: Added support for disabled transparent buttons in theme.
  Attempt to fix issue #1742(Disabled transparent buttons should stay transparent and "disable" text inside)
diff: @@ -250,6 +250,20 @@ export default (variables = variable) => {
  ...lightCommon,
  backgroundColor: null,
  },
  + '.disabled': {
  + backgroundColor: 'transparent',
  + borderColor: variables.btnDisabledBg,
  + borderWidth: variables.borderWidth * 2,
  + 'NativeBase.Text': {
  + color: variables.btnDisabledBg,
  + },
  + 'NativeBase.Icon': {
  + color: variables.btnDisabledBg,
  + },
  + 'NativeBase.IconNB': {
  + color: variables.btnDisabledBg,
  + }
  + }
  },
  '.small': {
  