add a global schema example
fixed up the README and examples to actually work with the instructions given
statics example added
added vim tags file to the ignore list
added querybuilder example
added promise example
added replica set example
added mapreduce example
small fix in package.json
updated README
Merge remote-tracking branch 'origin/mapreduce' into mquery
all model.querying.test.js unit tests are passing now

there were a couple bug fixes in the actual tests, as well as updates to
MongooseQuery from Query. Most bug fixes were in the MongoosQuery and
Model methods though.