Added recipe for using MongoDB with Monger
Improved Mongo recipe

* Fixed code blocks
* Added See Also section
* Moved some solution to discussion
Remove a level of directories for unit testing recipe
Added recipe for serving static files through Ring
Merge pull request #178 from cndreisbach/mongo-recipe

Added recipe for using MongoDB with Monger
Linkify CongoMongo
Merge pull request #189 from cndreisbach/static-files

Added recipe for serving static files through Ring
Added notes about wrap-file-info to static file recipe
Merge branch 'static-files'