0.6.0

Updated to use 0.10.x versions of the iOS and Android native Mobile Center SDKs.

Added new mobile-center package to handle common Mobile Center functionality, including support for custom properties and setting the logging level.

Added callback support for Push.

Added the ability to set custom properties. Custom properties are name/value pairs you set on the client which are then sent to Mobile Center. They can be used in the Mobile Center web portal to create targeted audiences for push notifications, based on the value of those properties. And in the future you'll be able to use them for other things in Mobile Center too.

Improved error messages for the react-native link step. Also updated to no longer prompt for app secret during react native link if the app secret is already set; instead we just output the current value of the app secret along with the path where it's stored if the dev wants to change it manually. That all makes for a more streamlined getting started experience.