refresh build env

[stevermeister]

@bampakoa I've fixed playground, please have a look.
but broke test env :(

Plus: fixed focus issue - #47

[bampakoa]

@stevermeister ignore my previous comment. I am checking your PR right now and I will come back to you. By the way, it this the same playground?

[bampakoa]

"paths": {
      "ngx-wig": [
        "../dist/ngx-wig"
      ]
    }

otherwise tsc command fails

[bampakoa]

In ./playground/tsconfig.json add

"baseUrl": ".",
"paths": {
      "ngx-wig": [
        "../dist/ngx-wig"
      ]
}

otherwise, the IDE throws an error

In karma.conf.js append "exclude": ["./playground"] in the karmaTypescriptConfig for the tests to pass

[stevermeister]

@bampakoa sorry, did not get your point about tsconfig.json, could I ask you to make separate PR fix for it?