Change imports to scoped packages

[uderline]

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• All existing tests are passing
• Tests for the changes are included

What is the current behavior?

When using scoped packages, imports of inappbrowser do not work anymore.

What is the new behavior?

Fixes #36

[jdnichollsc]

Thanks for your help mate! <3