IOS crash fix

[babeone]

Now the library work on IOS too using GCDWebServer as dependency.

[dotemacs]

Thanks for doing this fix @babeone !

If anybody else stumbles upon this, to save yourself some time, just:

npm install https://github.com/babeone/react-native-http-bridge.git

@alwx please consider this PR and thanks for your work on this package.

[Alwinator]

@babeone @dotemacs Thank you for your contributions! I habe added your improvements to my new repo: react-native-http-bridge-refurbished

So, use the following for a maintained version:

npm install --save react-native-http-bridge-refurbished