Added support for QGIS Layer Definition files or simply QLR (see http://nathanw.net/2014/03/12/qgis-qlr/). QLR file is a file that points to the data, contains all the styling, and other information. You can then just add this file and it will do all the other magic for you. QLR makes it easy to add same layer to multiple map documents, inheriting all of the properties which have been set and works with any layer supported in QGIS, expect special plugin layers.