Ks89/angular-modal-gallery

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## I'm submitting a...
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<pre><code>
[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  <!-- Please search on GitHub for a similar issue or PR before submitting -->
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request
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## Current behavior
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## Expected behavior
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## Minimal reproduction of the problem with instructions
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## What is the motivation / use case for changing the behavior?
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## Environment (the most important section to fill very carefully)

<pre><code>
- @ks89/angular-modal-gallery version: X.X.X
- Node version: X.X.X  <!-- run `node --version` -->
- npm version: X.X.X  <!-- run `npm --version` -->
- Operating System and version:  <!-- Mac, Linux, Windows -->
- Angular version: X.Y.Z <!-- check your package.json -->
- angular-cli version (or SystemJS/Webpack): X.Y.Z <!-- for angular-cli run `ng -v` otherwise check your package.json-->
- I'm using Server Side Rendering with angular-universal: YES/NO
- I'm compiling with mode: DEBUG / PROD / PROD with AOT

<!-- Check whether this is still an issue in the most recent angular-modal-gallery version -->

Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX

Others:
<!-- Anything else relevant?  Operating system version, IDE, package manager, HTTP server, ... -->
</code></pre>


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