Merge pull request #78 from JCook21/Docs

Added docs for the rc command.

README.markdown

@@ -27,11 +27,16 @@ With the castle cloned, you can now link its contents into your home dir:
 
     homesick symlink pickled-vim
 
-
 You can remove symlinks anytime when you don't need them anymore
 
     homesick unlink pickled-vim
 
+If you need to add further configuration steps you can add these in a file called '.homesickrc' in the root of a castle. Once you've cloned a castle with one of these files apply these steps with:
+
+    homesick rc CASTLE
+
+The contents of the .homesickrc file must be valid Ruby code as the file will be executed with Ruby's eval construct.
+
 If you're not sure what castles you have around, you can easily list them:
 
     homesick list