feat(camera): add camera constants
feat(camera): add camera constants

closes #129

driftyco/ionic-native,xueron/ionic-native,klirix/ionic-native,xueron/ionic-native,ramonornela/ionic-native,klirix/ionic-native,driftyco/ionic-native,xueron/ionic-native,xueron/ionic-native,ramonornela/ionic-native,driftyco/ionic-native,klirix/ionic-native,ramonornela/ionic-native,ramonornela/ionic-native