Merge pull request #72 from arohner/master

Respect set-write-concern, fix race
Fix test after applying #72.
Update README to include all updates since 0.1.8.
Add example usage of set-write-concern.
Merge pull request #73 from seancorfield/master

Prepare for 0.1.9 release
Release 0.1.9
Start 0.1.10 development
Fix for connection?

The :db entry in a connection map can be nil, since it can be used as:

```clojure
(with-connection c
  (with-db d
    ...))
```

and the check for `c` being a connection is performed before a
database is assigned.
Merge pull request #75 from jaor/master

Fix for `connection?`
Update README for #75
Merge pull request #76 from seancorfield/master

Update readme for #75
Updating make-connection to accept a Mongo URI String in place of a database name
Merge pull request #79 from dsosby/makeconnectionwithuri

Updating make-connection to accept a Mongo URI String
0.1.10 Release
Update README for 0.1.10 release.
Start 0.1.11 SNAPSHOT
Fix bug where make-connection no longer accepts symbols
Merge pull request #80 from dsosby/fixdbnamebug

Fix bug where make-connection no longer accepts symbols
Add URL / license / mailing list info to project.clj for Clojars.
add security for :one? and :sort
Merge pull request #81 from Frozenlock/master

Security to prevent the use of :sort and :one? together
Add test for #81