Added repl.it to the docs

docs/comparison.rst

@@ -1,4 +1,3 @@
-
 Comparison
 ==========
 Xonsh is significantly different from most other shells or shell tools. The following

docs/devguide.rst

@@ -1 +1 @@
-.. include:: ../CONTRIBUTING.rst
+../CONTRIBUTING.rst

docs/index.rst

@@ -1,6 +1,7 @@
-
 .. include:: intro.rst
 
+.. include:: tryitnow.rst
+
 .. include:: comparison.rst
 
 .. include:: installation.rst

docs/tryitnow.rst

@@ -0,0 +1,9 @@
+Try It Now!
+===========
+Try out xonsh right here in the browser. Just press the triangle play button in
+the bottom right of the `Repl.it <https://repl.it>`_ frame below.
+**Note:** this is not a fully featured xonsh instance due to repl.it limitations.
+
+.. raw:: html
+
+    <iframe height="400px" width="100%" src="https://repl.it/@scopatz/xonsh?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>

news/replit.rst

@@ -0,0 +1,13 @@
+**Added:** None
+
+**Changed:**
+
+* Xonsh live example has been re-added back to the documentation.
+
+**Deprecated:** None
+
+**Removed:** None
+
+**Fixed:** None
+
+**Security:** None