Adding .gitattributes + documentation enhancements

1. Added .gitattributes file to avoid problems line endings.
2. Added docimentation on how to update Hoggorm from command line
Quickstart-part of documenation.

.gitattributes

@@ -0,0 +1,17 @@
+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Custom for Visual Studio
+*.cs     diff=csharp
+
+# Standard to msysgit
+*.doc	 diff=astextplain
+*.DOC	 diff=astextplain
+*.docx diff=astextplain
+*.DOCX diff=astextplain
+*.dot  diff=astextplain
+*.DOT  diff=astextplain
+*.pdf  diff=astextplain
+*.PDF	 diff=astextplain
+*.rtf	 diff=astextplain
+*.RTF	 diff=astextplain

docs/quickstart.rst

@@ -24,8 +24,11 @@ Make sure that Python 3.5 or higher is installed. A convenient way to install Py
 - numpy
 
 
+Installation and updates
+------------------------
+
 Installation
-------------
+++++++++++++
 
 Install Hoggorm easily from the command line from the `PyPI - the Python Packaging Index`_. 
 
@@ -35,6 +38,16 @@ Install Hoggorm easily from the command line from the `PyPI - the Python Packagi
 
 	pip install hoggorm
 
+Updating
+++++++++
+
+To update Hoggorm from an previously installed oudated version execute the following from the command line:
+
+.. code-block:: bash
+        
+        pip install --update hoggorm
+
+
 If you need more information on how to install Python packages using pip, please see the `pip documentation`_.
 
 .. _pip documentation: https://pip.pypa.io/en/stable/#