Add support for Excerpts

Added support for Excerpts and added sample template for using them for
read more functionality
get Categories with number of Posts
created blog:path for using MiniBlog as Virtual Application

The idea is to be able to use MiniBlog as Virtual Application just by
tweaking the Web.config
bug fix with AntiForgery token when in virtual directory
More excerpt sample into OneColumn theme
Add excerpt editing to TwoColumn and OffCanvas
Merge pull request #95 from sbulluk/master

Add support for Excerpts
Fixed a bug where the excerpt div didn't show when creating new posts.
Merge pull request #96 from fredrikeriksson/excerpt-fixes

Fixed a bug where the excerpt div didn't show when creating new posts.
updating README.md
Merge branch 'master' of https://github.com/madskristensen/MiniBlog

Conflicts:
	Website/scripts/admin.js
fix Comment Anti-forgery bug
Fix issue for Excerpt edit on new post
combine GetCategories methods
fix BlogPath
Added Excerpt to index page
Adding excerpt support to WLW post updates
Merge pull request #101 from sbulluk/master

Fix issue for Excerpt edit on new post
removed CategoryInfo
no caching when user is authenticated