Create distribution files where default export is the global ImageVie…

…wer.

- Rewrite the whole module in es6

- Removed jQuery dependency
- Use Rollup to build files
- Use Parcel to run example
- Exposes a different class for the FullScreenMode
- Lot of bug fixes

Updated bower

Fixed #4 (Position is not properly modified when zooming out)

Merge branch 'master' of https://github.com/s-yadav/ImageViewer

Mouse wheel handled with browser scroll and code cleaning

Minor Bug fixes