Merge pull request #37 from nicholas-l/patch-1

Merge pull request #34 from nscarcella/typescript-types

Provide dragState to callbacks

typescript types as discussed in #33

Incremented patch number

Added isActive to the subscribeTo prop

Updated minor version to prepare for new release

Merge pull request #29 from chrisjpatty/features/performance-mode

Updated readme to make it clear that subscribeTo is optional

Syntax fixes

Upgrade flow types

Minor fix that was failing droppable test

Updated readme

Implemented shouldComponentUpdate

Added ability to individually subscribe to keys in the store for performance reasons