Wrap x feature for pull request

[dulcedilip]

attribute added to the olHelper service for all source types

oSource = new ol.source.OSM({
                attributions: createAttribution(source),
                wrapX: (source.wrapX === undefine) ? 1 : source.wrapX // added for single map tile
            });

By default it take multiple maps for tiles.
usuage :

source: {
            type: "OSM",
            url:"",
            wrapX: true // wrapx: false  or remove attribute it will take default
        }

[juristr]

@dulcedilip Awesome, thx for your contribution. Would you mind squashing your changes into a single commit that follows our contribution guidelines?

Let me know if you need help with that. Once done, I'm happy to merge it in!

[dulcedilip]

Thank you @ juristr. I created two branches one for my usuage in my project with dist files and another for pullrequest with your standarads. You can consider wrapxforpullfequest and ignore the other.

[juristr]

@dulcedilip Ok, I see. could you submit that branch as another PR? Would that be possible? thx 😄

[dulcedilip]

For reference : Wrap x feature for pull request #198
Still this is open you can take this as pull request.
i am unable to give you pullrequest