Android X Update

[simon1867]

It would be great to have a release branch from the tag 4.2.4 that I could merge this into and then tag that branch with a 4.2.5 release. Right now I have to include Jetifier=true in the gradle.properties file because DBFlow is using the support annotations library. It would be nice not to need that to increase build performance.

[guillermomuntaner]

@agrosner This proposal would be a great quick fix for everyone using DBFlow <5 that is currently having this jetifier issue.

[loquitowen]

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