Update mongodb-core patch level

[shakefu]

The latest ([email protected]) fixes errors in mongodb-core (@1.1.9) where the bson C++ extension fails to build and then complains loudly about it every time the module is instantiated.

Gets rid of this:

{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version

[sorribas]

Thanks very much. Travis failed but I tested it on my machine and it seems to work. I'll look into the travis config as there seems to be somthing wrong with it.

[sorribas]

Actually, I made a mistake, I ran the tests before running npm install (silly me). So the error that showed up in travis is actually happening. I'll look into it.