Simplify building process

[radeno]

Hello,

thanks for this great module for React Native, but without published newest beta in NPM i have been forced to build it by own.
Never worked with Typescript before so this was most caveats what i met.

1. Include all necessary dependencies into package.json
   Remove setup.sh script and add all dependencies as devDependencies it is more automatized to build package

    "file-directives": "^1.4.6",
    "tslint": "^5.11.0",
    "typescript": "^3.1.1"

2. Add needed types to tsconfig.json
   Just add types dependecies: "types": ["react", "react-native"]
3. dom library in tsconfig.json is conflicting with react native because Geolocation is defined in DOM and React-Native as same.
   need to skip library checking in tsconfig.json
   "skipLibCheck": true

Then i was able to build whole package just with one command npm run build and it works seamsless.

[radeno]

PR #257

[radeno]

Merged