Changed "Revolution Analytics" to Microsoft #215

DESCRIPTION

@@ -10,8 +10,8 @@ Description: The goal of checkpoint is to solve the problem of package
     are available to your project, thereby avoiding any package updates that came
     later and may have altered your results. In this way, anyone using checkpoint's
     checkpoint() can ensure the reproducibility of your scripts or projects at any
-    time. To create the snapshot archives, once a day (at midnight UTC) Revolution
-    Analytics refreshes the Austria CRAN mirror, on the "Managed R Archived Network"
+    time. To create the snapshot archives, once a day (at midnight UTC) Microsoft
+    refreshes the Austria CRAN mirror, on the "Microsoft R Archived Network"
     server (http://mran.microsoft.com/). Immediately after completion
     of the rsync mirror process, the process takes a snapshot, thus creating the
     archive. Snapshot archives exist starting from 2014-09-17.