RUBY-614 support for SASL PLAIN authentication (LDAP)
RUBY-614 test coverage for SASL PLAIN support
minor: removing unnecessary username in sasl plain
RUBY-698 adding deserialization options to collection#find and bson
Fix min_key decoding on ARM RUBY-704

Tested on armhf - Raspberry Pi.
Merge pull request #312 from behackett/1.x-stable

Fix min_key decoding on ARM RUBY-704
Merge branch '1.x-stable-ruby-676' of github.com:gjmurakami-10gen/mongo-ruby-driver into gjmurakami-10gen-1.x-stable-ruby-676
minor: adding MONGODB qualifier to all auth test env vars
Merge branch '1.x-stable' of github.com:mongodb/mongo-ruby-driver into 1.x-stable