Added trunk8 library

This PR adds the trunk8 library. trunk8 is an intelligent text truncation plugin to jQuery.

I am not the author of the library. The library's homepage can be found at: http://jrvis.com/trunk8/ This is also where I downloaded the normal and minified version of the library (through the download button). The source code of the library can be found at: https://github.com/rviscomi/trunk8