Add typescript support

[wsdt]

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[dkhd]

A handy quick hack tips to use this in Typescript:

1. import ImageFilter from 'react-image-filter' in your ReactJS class/function
2. make a new directory and file in /src/@types/alltypes.d.ts
3. Fill with declare module 'react-image-filter'
4. Open your tsconfig.json
5. Add "typeRoots" : ["src/@types", "./node_modules/@types"], in your compilerOptions
6. SetnoImplicitAny to "noImplicitAny": false,
7. It works!