Damien Vieira

Added custom animation for presenting and dismissing bottom sheet

1

Adding custom animation, previously suggested on this [PR](https://github.com/weitieda/bottom-sheet/pull/11) but this time with the changes currently on Master.

Add delegate to check if pan gesture should begin

2

### Summary This change allows to control if the pan gesture should begin or not. This is particularly important when your table view supports drag and drop or swipe to...