Change formatTime function to add leading zeros for 24 hour format

Change formatTime function in DateUtils.java

Gratipay is not longer available, so removing it.

Update README.md

Also acts as a test of commit correctly to the project. :)

Updating Gradle (gradle-wrapper.properties) from 2.10 to 3.3

Also updating the testDependencies to match the build tools version (25)
So no more warnings about mismatched versions of dependencies, so I guess you can compile it correctly without warnings, so this is like a start for updating the app.

It is not fixed completely, it is crashing because It can't find the view where to attach the action icon and the action text. It returns null.

 The method is looking for a TextView but in the Actual resource file it is an 'AppCompatButton' I solved this, yet the code does not find the view.

 In the code I stated this and tried a couple of things but it doesn't seem to work.

Now using Gregorian Calendar in API >22 :)

Now using Gregorian Calendar in API >22 :) (In InactiveTimeHelper.java) I missed it for some reason 🤦

…Chep#118)

This does mean that It'll start in the same orientation as the activity that was showing before.
From Android Developers: "The same orientation as the activity that's immediately beneath it in the activity stack."
I thought about use cases and this is the most appropriate approach. and it doesn't hurt current users because most of them will have their phone in Portrait orientation, and for the ones using landscape then okay, Lockscreen will start in landscape too, and the screen contents fit correctly.

…the support's one