Create about_libraries_def.xml

Allows AboutLibraries (https://github.com/mikepenz/AboutLibraries) to autodetect the usage of this library and show it on a dialog:

![roundedimageviewos-library](https://cloud.githubusercontent.com/assets/6595407/4589213/8afe3754-5050-11e4-819b-57d72fad8d61.png)