add <div.zoomable-image__margin/> to keep margin of the image on zooming
move setting `scrollLeft` and `scrollTop` of container from callback of
`setState` to `componentDidUpdate`
add 'hammerjs' package for touch gesture detection
rewrite `ZoomableImage` using 'hammerjs'
* Improved media modal
ImageLoader: Impliment pinch zoom by CSS `transform: scale(X)`
ImageLoader: Impliment panning by CSS `overflow: scroll`
ImageLoader: Larger image
MediaModal: Larger close button
MediaModal: Close the modal by swiping vertically
MediaModal: Show/hide close button and right/left navigation on tapping image
MediaModal: Change the `pointer-event` CSS prpp to get more blank space to close the modal
ImageLoader: Zoom/reset zoom on double tap
MediaModal: disable vertical swiping while horizontally swiped
ImageLoader: prevent propagating touchmove event to MediaModal
MediaModal: Adjust size and potision of buttons
ImageLoader: Adjust scroll potision on pinch zoom
* Remove "swipe to close" and "double tap to zoom" features
* remove unused prop and functions
removed `onScroll` prop and `handleScroll` func in ImageLoader
* separate zoom functionary to ZoomableImage component
adjust styling of ImageLoader
add styling for ZoomableImage
* adjust size and potision of close button of media modal
* Fix for gif video
add `onClick` prop to ExtendedVideoPlayer
specify `onClick` prop to video tag for switching nav of `MediaModal`
add `.video-modal` class to scss to separate styling for `VideoModal`
* fix styling for centering
specify height of `ZoomableImage` by pixel
clean styling for `ImageLoader`
* fix lint errors
* small fix
* fixed designated parts
Yuto Tokunaga