TypeScript refactor, fix exact sizing (wrong branch)

[peacechen]

Fixes #94

• Fix bug when maxHeight === minHeight && maxWidth === minWidth.

Additionally:

• This project has been converted to TypeScript with a generated type definition file.
• The main method imageFileResizer accepts an options object argument instead of multiple individual arguments.
• It returns a Promise instead of using a callback.

This PR refactors the code as properly typed functions. The parameters are in a single options argument instead of multiple arguments. The TypeScript definition file is automatically generated.

Also addresses #93 , #78 , #62, and #50.

The code in this PR has been published as @peacechen/react-image-file-resizer pending merge.

[peacechen]

Wrong source branch. Creating another one