CXX-765 Update readme to reflect stable C++11 driver

Author: acmorrow

README.md

@@ -1,27 +1,30 @@
 # MongoDB C++ Driver [![Build Status](https://travis-ci.org/mongodb/mongo-cxx-driver.svg?branch=26compat)](https://travis-ci.org/mongodb/mongo-cxx-driver)
 Welcome to the MongoDB C++ Driver!
 
-Use this branch if:
+Please see our [wiki page](https://github.com/mongodb/mongo-cxx-driver/wiki/Download-and-Compile-the-Legacy-Driver) for information about building, testing, and using the driver.
 
- - You have existing code that used the driver from the server source and want it to continue working without modification.
+  Version [legacy-0.0-26compat-2.6.12](https://github.com/mongodb/mongo-cxx-driver/tree/legacy-0.0-26compat-2.6.11) of the
+  C++ legacy driver has been released. Please report any bugs or issues in the C++
+  [JIRA project](http://jira.mongodb.org/browse/CXX).
 
-Switch to the legacy branch if:
-
- - You are using MongoDB's C++ driver for the first time.
- - You had been using 26compat (or the driver inside of the server source) and want to benefit from incremental improvements while having the same overall API.
+Use this branch only if you have existing code that used the driver
+from the server source and want it to continue working without
+modification. Switch to the "legacy" branch if you had previosuly been
+using 26compat (or the driver inside of the server source) and want to
+benefit from incremental improvements while having the same overall
+API. Switch to the "master" branch if you are using MongoDB's C++
+driver for the first time.
 
 > **Note:** As of MongoDB 2.6.0-rc1, it is no longer possible to build the driver from the server sources: this repository is the only approved source for driver builds.
 
 ## Repository Overview
 
 | Branch   | Stability   | Development       | Purpose                                                      |
 | -------- | ------------| ----------------- | -----------------------------------------------------        |
-| master   | Unstable    | Planning          | New C++11 driver (work in progress)                          |
+| master   | Stable      | Stable Evolution  | New C++11 driver                                             |
 | legacy   | Stable      | Stable Evolution  | Primary stable C++ driver release                            |
 | 26compat | Stable      | Maintenance Only  | Drop in replacement for users of existing 2.6 era C++ driver |
 
-> **WARNING:** The master branch will contain future development work on a new driver with a completely new API and implementation. It is a work in progress and currently should not be used.
-
 ## Components
 
   - `libmongoclient.[so|dylib|dll]` - The shared mongoclient library (but see notes)