fix-#725: queryset delete() should return the number of deleted objects
Added PyPy3 to the build matrix.
Merge pull request #727 from DavidBord/fix-725

fix-#725: queryset delete() should return the number of deleted objects
Added landscape.io badge.
Added PyMongo 2.7.2 to the build matrix.
Merge pull request #728 from MongoEngine/topic/landscape-io

Added landscape.io badge
Update .travis.yml

Added coveralls coverage...
fix-#733: index_cls is ignored when deciding to set _cls as index prefix
Merge pull request #738 from DavidBord/fix-733

fix-#733: index_cls is ignored when deciding to set _cls as index prefix
Update for add the change that closes issue #733
Update .travis.yml for allow failures in pypy3
Merge remote-tracking branch 'upstream/master'