fixed; calling model.distinct without conditions

closes #1541
update History
Update CONTRIBUTING.md
Update CONTRIBUTING.md
fix server.js

https://github.com/LearnBoost/mongoose/pull/1546
first work on geoSearch
Merge pull request #1551 from 10gen-interns/globalschemas

add global schema example
Merge pull request #1552 from 10gen-interns/example_inst_fix

fixed up the README and examples to actually work with the instructions
Added geoSearch support for models

All tests passing and geoSearch works. Still need to cast the return
documents back into their models
Merge pull request #1553 from 10gen-interns/statics

add statics example
Merge pull request #1554 from 10gen-interns/querybuilder

add querybuilder example
added promise example
update example README
added replica set example
updated README
clarify replset example
Merge pull request #1556 from 10gen-interns/replicasets

add replica set example
added mapreduce example
small fix in package.json
updated README