Added MongoDB version OSX X86-64 v2.6.1

Added MongoDB version OSX X86-64 v2.6.1 in folder mongodb.
This db can be used when working on Mac OSX,
otherwise download the proper version from
http://www.mongodb.org/downloads
Added MongoDB data folder

Added a MongoDB data folder.
This folder will be used to store the projects data.
Make sure to start-up the mongos server referring to this data folder.
Updated project with Spring MongoDB example

- added dependencies to mongodb, spring-data-mongodb, spring-core,
slf4j, log4j, junit, mongo-java-driver and spring-test
- created a test-application-config used by the projects test classes
- created a Person Entity and PersonRepository using the Spring data
framework
Added README

Added README containing a first set of steps on how to start-up the
MongoDB database.