Add -l|--lite option to install which includes new syntax files with lower precedence

Readme.rst

@@ -8,7 +8,7 @@ These should be placed inside of the ``~/.nano/`` directory.
 Alternatively::
 
     git clone git@github.com:scopatz/nanorc.git ~/.nano
-    
+
 *Note - if you have any issues, alternatively use::
 
     git clone https://github.com/scopatz/nanorc.git ~/.nano
@@ -24,7 +24,7 @@ You can also append the contents of ``~/.nano/nanorc`` into your
 ``~/.nanorc`` to include all languages::
 
     cat ~/.nano/nanorc >> ~/.nanorc
-    
+
 Finally, you can run an automatic installer using the following code::
 
     $ curl https://raw.githubusercontent.com/scopatz/nanorc/master/install.sh | sh
@@ -32,3 +32,8 @@ Finally, you can run an automatic installer using the following code::
 or alternatively::
 
     $ wget https://raw.githubusercontent.com/scopatz/nanorc/master/install.sh -O- | sh
+
+*Note -
+    some syntax definitions which exist in Nano upstream may be preferable to the ones provided by this package.
+    The install.sh script may be run with ``-l`` or ``--lite`` to insert the included syntax definitions from this package
+    with lower precedence than the ones provided by the standard package.