MX7 deprecations
MX7 deprecations

- Fixed `mendix.lang.nullExec`, considered deprecated (removed from boilerplate as well)
- Fixed subscriptions: Use `this.subscribe` instead of `mx.data.subscribe`. You can use `this.unsubscribeAll()` to remove subscriptions

Could you make a release for the AppStore (only 1.1 is available right now)?
Andries-Smit/Bootstrap-Progress-Bar,Andries-Smit/Bootstrap-Progress-Bar