Assert compatibility with MongoDB 3.0 [DATAMONGO-1158]

[spring-projects-issues]

Christoph Strobl opened DATAMONGO-1158 and commented

Check drivers to be used and tests against MongoDB 2.4 onwards

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Referenced from: pull request #273

[spring-projects-issues]

Oliver Drotbohm commented

Great job so far, a few minor comments for polishing

[spring-projects-issues]

Christoph Strobl commented

Altered the PR according to comments on github. Please revise.
Note: I did not squash commits yet so that one is able to see what happend through out the implementation. Need to squash when we decide to move this into master