Clean up adapter section and fix mongo references
Add alias mongodb to mongo adapter
Add "how to install adapters" section
Add docs on .connect/.disconnect & those events
Note about createAdapter config param
Remove deprecated doc on manually setting adapters
Note about Riak, in-memory, & filesystem adapters
Add docs for setAdapter
Fix format of defineProperties in setAdapter docs
Fix link
NPM->npm
Merge pull request #203 from OscarGodson/patch-3

Clean up adapter section and fix mongo references