Add install instructions for cloning WebDAV component (which I think is best if we make optional). There may be webserver dependencies so let's just call this a plugin of sorts, but different than normal plugins because if it's installed it will be tightly integrated with everything we do. Eventually we may provide a static repository or select a specific sabre-dav version so that we're immune from changes upstream which break stuff we're doing; but for now we'll use the fruux main repository and install using the trunk.

install/INSTALL.txt

@@ -103,6 +103,24 @@ directory/path component in the URL) is REQUIRED.
 
 			git pull
 
+	- If you wish to use WebDAV file services
+
+        - First you should be **on** your website folder
+
+            cd mywebsite
+
+        - Then you should clone the sabre-dav repository (separately)
+
+            git clone https://github.com/fruux/sabre-dav sabre
+
+        - For keeping the sabre tree updated, you should be on you sabre tree and issue a git pull
+
+            cd mywebsite/sabre
+
+			git pull
+
+
+
 
 3. Create an empty database and note the access details (hostname, username, 
 password, database name).