Replace removed ProgressBar with more stable Indicator

[SecUpwN]

After removing the glitchy ProgressBar with #673, I consider it important to now re-add a more stable visual Indicator. I've digged through many projects and collected some ideas. Feel free to add yours!

• SmoothProgressBar (my current favourite is the gradient design)

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• MaterialLoadingProgressBar

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• android-PullRefreshLayout

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• SwipyRefreshLayout

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• Android-MaterialRefreshLayout

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[larsgrefer]

We already have a SwipeRefreshLayout: http://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.html So there is no need for an extra dependency i think

[SecUpwN]

We already have a SwipeRefreshLayout

@larsgrefer, are projects like Ultra-Pull-To-Refresh and MaterialProgressBar of use for us?

[larsgrefer]

Everything we would need from Ultra-Pull-To-Refresh is the material style we already have in the support-v4 library.

Our progressbars are already material styled by the appcompat-v7 library

So imho we don't need any extra libraries at the moment

[SecUpwN]

So imho we don't need any extra libraries at the moment

Hm.. so why don't we have a progress indicator showing then? :P

[larsgrefer]

Be patient

[SecUpwN]

Be patient

Sorry, I will.

[SecUpwN]

Seems like everyone is very busy these days. @CellularPrivacy/design please help to fix this. Reading https://github.com/CellularPrivacy/Android-IMSI-Catcher-Detector/issues/678#issuecomment-163327400 and https://github.com/CellularPrivacy/Android-IMSI-Catcher-Detector/issues/678#issuecomment-167161732, it appears that we do not need to add more depencies, but just enhance the existing pull-to-refresh to work across our whole app. Comments are very welcome.