[Feature] Programmatic navigation between pages#7

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buuhuu wants to merge 2 commits intoPeterStaev:masterfrom

buuhuu:feature/upstream-programaticSwipe

Commits on Jun 18, 2017

- expose the static _imageCache member of ImageSwipeBase so it can be set by consumers in case they already have an instance of it in their app
Dirk Rudolph
committed
- added nextPage() prevPage() to programmaticaly navigate between pages
Dirk Rudolph
committed