Merge pull request #687 from neilmb/patch-1

Fix typo in tuorial

tutorial.ipynb

@@ -8,7 +8,7 @@
     "\n",
     "The best way to learn to use any tool is to actually use it. In this tutorial we will use agate to answer some basic questions about a dataset.\n",
     "\n",
-    "The data we will be using is a copy of the [National Registery of Exonerations]( http://www.law.umich.edu/special/exoneration/Pages/detaillist.aspx) made on August 28th, 2015. This dataset lists individuals who are known to have been exonerated after having been wrongly convicted in United States courts. At the time this data was copied there were 1,651 entries in the registry."
+    "The data we will be using is a copy of the [National Registry of Exonerations]( http://www.law.umich.edu/special/exoneration/Pages/detaillist.aspx) made on August 28th, 2015. This dataset lists individuals who are known to have been exonerated after having been wrongly convicted in United States courts. At the time this data was copied there were 1,651 entries in the registry."
    ]
   },
   {