Implemented C++ MongoException for decoder
Increase make jobs for faster builds
Make exception classes available in C++
Fix throwing of MongoException from BSON decoder
Merge pull request #41 from 10gen-labs/test-encode-decode

Implemented C++ MongoException for decoder
Merge branches 'master' and 'gh40-cmd-collection' of https://github.com/10gen-labs/mongo-hhvm-driver into gh40-cmd-collection
Intermediate commit for command integration