Added Excerpt to index page
Adding excerpt support to WLW post updates
Now sets the RSS/Atom summary with the excerpt if any is set.
Added CDN url setting
Added CDN and youtube support
Removing HTTP unwanted headers
Added blogPath in the commenting functionality.
Minor updates
Removes unwanted HTTP header
Removes "server" HTTP header
Removes "server" HTTP header (correctly)
Updated README
Added removal of OutputCacheItem if blogpost updates. Fixes #105.
AJAX requests now skips customError behavior

Added code i Global.asax to prevent redirects to ~/ or ~/404.cshtml
when the request is considered an AJAX request.
This is to prevent redirections of the requests which results in a
valid page and status code 200 and not the status code from thrown
HttpException which results in that the success/fail functionality
always thinks it's a success, even when it's not.

Fixes #104
Removes the OutputCacheItem when deleting a post

Applies the same code as previosly added for Edit.
Also creates a common static method in Blog for this.
fixes local path issue when using as virtual application