pass options from check() and checkZip() through to readTheme() so the labs flags are available where needed
when labs.customThemeSettings === true, inside readTheme() read package.json and add a customSettings property to the theme object returned by check() and checkZip()
refs https://github.com/TryGhost/Team/issues/1070
optionsfromcheck()andcheckZip()through toreadTheme()so the labs flags are available where neededlabs.customThemeSettings === true, insidereadTheme()readpackage.jsonand add acustomSettingsproperty to the theme object returned bycheck()andcheckZip()