Added deprecation notice to tags parameter.
Merge pull request #27 from ashtuchkin/remove-mongodb-driver-dependency

Make deprecation notice for unsupported 'tags' parameter of Query.read() method.
release 0.5.1
Done the TODO

Needed it without the dependency on mongoDB
Use fixed mongodb version, fixes learnboost/mongoose#1895
Merge pull request #29 from AvianFlu/master

Use fixed mongodb version, fixes learnboost/mongoose#1895
Merge pull request #28 from refack/patch-2

Done the TODO
tests; add failing ReadPref test

#30