Fix a few markdown issues found by markdownlint. (#87)

Author: rolfbjarne

README.md

@@ -1,22 +1,23 @@
 # Touch.Unit
 
-<div align="centre"><i>because I like my code public and my mistakes private</i></div>
-
+ _because I like my code public and my mistakes private_
 
 ## History
 
 [I searched, but I did not find.](http://stackoverflow.com/q/7065071/220643) [So I made](http://spouliot.wordpress.com/2011/09/28/unit-testing-and-monotouch/) [and shared.](https://github.com/spouliot/Touch.Unit)
 
-
 ## How To
 
 1. Clone all the required code from github.com
 
-	$ git clone git://github.com/spouliot/NUnitLite.git
-
-	$ git clone git://github.com/spouliot/Touch.Unit.git
+    ```shell
+    $ git clone git://github.com/spouliot/NUnitLite.git
+    ...
+    $ git clone git://github.com/spouliot/Touch.Unit.git
+    ...
+    ```
 
-	note: make sure to pull from all of them to get the latest fixes
+note: make sure to pull from all of them to get the latest fixes
 
 2. Launch Xamarin Studio (4.0 or later)