Support Angular 4

[Ks89]

I know, Angular4 is still work in progress and it will be released on March 2017.

I tried to use Angular 4 beta 1 in my project and this one is the only third party library that is not working.

So I decided to open this issue to show the problem.

Error message:
"Unexpected value 'ImageModal' declared by the module 'AppModule'"

[Ks89]

Since this library seems not maintained actively, I decided to fork it to create another library called angular-modal-gallery to support Angular4, AOT and so on...

This is not a critics to the developer, I know that it is very difficult to maintain an open source project, but it is a way to continue to use this library in our projects.

If you want to join me, you are welcome :)

https://www.npmjs.com/package/angular-modal-gallery

Thank u,
Ks89