I am aware that in the Retina MBP, the HDD and RAM are soldered in and cannot be changed by the user. I don't need an rMBP. I am considering the non-retina new MacBook Pro 15". Will I be able to change the RAM and HDD in that? I would want to put in 8GB RAM (2x 4GB) and possibly a SSD down the road. Just want to know if / be sure that's possible. Thanks!