General improvements and fixes (#58)

* Fixes Nimble package structure.
* Improves readme.
* Fixes compatibility with devel.
* Add nice error message when ROOT is missing.
* Pass responseText instead of statusText in ajax callbacks.
* Implements verbatim node.
* Apparently it should just be true all the time.
* Small fix to readme.
* Fixes verbatim node updates.
* Move karun into the `karax` directory so that it's installable.

readme.rst

@@ -7,9 +7,11 @@ to change.
 
 To try it out, run::
 
-  git clone https://github.com/pragmagic/karax
+  cd ~/projects # Insert your favourite directory for projects
+
+  nimble develop karax # This will clone Karax and create a link to it in ~/.nimble
+
   cd karax
-  nimble install # For first time
 
   cd examples/todoapp
   nim js todoapp.nim