Add KTH to users.html.markdown (#98)

* Add KTH to users.html.markdown

* Update users.html.markdown

Update kth link to main homepage
diff --git a/source/users.html.markdown b/source/users.html.markdown
index c3bd632..73a5b76 100644
--- a/source/users.html.markdown
+++ b/source/users.html.markdown
@@ -52,6 +52,7 @@
 * [Imperial College](http://www.imperial.ac.uk/computing)
 * [InhouseIT](http://www.inhouseit.com)
 * [INRIA](http://inria.fr)
+* [KTH](http://kth.se)
 * [Kumo](http://kumo.com.co)
 * [M5 Hosting Inc](http://m5cloud.com)
 * [Melbourne University](http://nectar.org.au)