#5 - Add sample for derived deleteBy.

Original pull request: #14.
Fix failing MongoDB exposesGeoSpatialFunctionality test case for travis.

Make distance check in exposesGeoSpatialFunctionality test case more robust against 
minor numeric differences. Travis CI seems to use an older Mongo DB version that produces a slightly different result than what we get.
Added custom class rule to cope with mongo versions that don't support text-search.

TestSearch is only supported from MongoDB 2.6 but travis CI uses an older version at the moment.
Upgraded to Maven APT Plugin 1.1.2 and Querydsl 3.4.3.

Added Christoph as project maintainer, too. Fixed maintainer's email addresses. Removed obsolete encoding property. Upgraded to Lombok 1.14.6. Switched to simplified Java 8 setup (using the property instead of a plugin declaration).
Upgrade to Spring 4.1.

Switched to Rome 1.5 for MongoDB text search example as that's needed after the Spring 4.1 upgrade.
#13 - Upgrade to Spring Data Evans GA.

Prepare upgrade by switching to snapshots.