RUBY-532 fix for threading issue in socket pool
RELEASE 1.8.2
minor: fixing copyrights, consolidating into LICENSE. I should be doing something more important.
RUBY-538 adding gem signature and new contributor to gemspecs
fix cbson compile warnings
Optimize BSON::ObjectId.to_s with a C extension.
RUBY-543 fix for broken logic in the pool manager refresh
added support for append mode in gridfs