Database style cleanup

[SUPERCILEX]

Style nit: style guide says emums should be in caps.

[puf]

I have no problem with the change itself. But keep in mind that this is a change to a public interface, so must happen pre-1.0 or in a major. :-/

[samtstern]

@puf actually I don't believe this is a public interface change since OnChangedListener is a child of FirebaseArray which is package protected. When I try to create a new instance of OnChangedListener in my class I get:

"com.firebase.ui.database.FirebaseArray" is not public in "com.firebase.ui.database".  Cannot be accessed from outside package.

[samtstern]

@puf are you ok with this change given my previous comment?

[puf]

Yup.

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@puf https://github.com/puf are you ok with this change given my
previous comment?

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[samtstern]

Merged, @SUPERCILEX thanks!

[SUPERCILEX]

Thanks!