Runtime Permissions

[alexstyl]

Description

This PR introduces Runtime permissions introduced in Android 6.0. When running in devices prior to 6.0 the app should behave the same as before.
On Android 6.0 the following permissions are requested:

• READ_CONTACTS Contact permission when accessing the Upcoming Events, Search and Date Details screen. The user is granted access if they grant the required permission. If no, the app closes.
• READ_EXTERNAL_STORAGE When the user tries to select a Ringtone on the Daily Reminder screen, they are prompted to grant the said permission.

NOTE: For some reason the onActivityResult of the DailyReminderActivity does not get called. That might be caused because of the custom version of PreferenceFragment we are using.

Test(s) added

Yup. Around ContactPermissionRequest. Because of that this PR also introduces the

testOptions {
        unitTests.returnDefaultValues = true
    }

option in order to be able to test the Navigator class. At the initialisation of the class a Uri field was getting instantiated making the tests crash

Screenshots

Upcoming	Ringtone