K-9 launcher icons for all required densities (Medium - XXX High DPI)

On my Nexus 5, I've recently noticed that K-9's launcher icon looks a bit fuzzy, while the preview image in the Play Store is really really nice.
So I took the 512px png file from the images directory and created the following icon assets to provide a beautiful K-9 experience on high resolution smart phones.

Here's a link to the Android Documentation regarding iconography and screen densities: http://developer.android.com/design/style/iconography.html

And these are two screenshots showing the app icon before my changes on the right hand side and the high resolution version on the left:
![k9-icon-comparison](https://f.cloud.github.com/assets/3253577/1505805/58ec30ca-48ec-11e3-8ffe-02d0300ac0b4.png)