Fix Nemo crashing when opening a new tab in Ubuntu 16.04

If you use the default version of Nemo with Ubuntu 16.04, it crashes if you open a new tab while other files are selected. Upgrading to Nemo 2.8.7 fixes this bug.

You can upgrade by running these commands:

sudo add-apt-repository ppa:webupd8team/nemo
sudo apt-get update
sudo apt-get install nemo nemo-fileroller

More information:
http://www.webupd8.org/2016/03/nemo-with-unity-patches-available-for.html
http://www.webupd8.org/2013/10/install-nemo-with-unity-patches-and.html