Update README to reference 'kit' after rename from 'materials'

Author: Matthew McCullough

README.md

@@ -1,25 +1,25 @@
-# GitHub Training Materials
+# GitHub Training Kit
 
 This is the official courseware for the [GitHub Training Team](http://training.github.com). This repository provides open source materials and slides for teaching GitHub Classes under the [_CC BY 3.0_ license](http://creativecommons.org/licenses/by/3.0/).
 
-We know that part of effectively sharing GitHub and Git with the world goes beyond our team's course offerings. We are excited to provide you with training materials that you can also use to teach these same concepts at your company, for a user group, or even at a conference.
+We know that part of effectively sharing GitHub and Git with the world goes beyond our team's course offerings. We are pleased to provide you with this training kit that you can use to teach these same concepts at your company, for a user group, or at a conference.
 
 ## Download
 
 We know that many of the users of this repository are just focused on getting the materials and teaching from them.  We've made that easy.
 
-1. You can view and teach from the materials, hosted on GitHub, at http://training.github.com/materials
-2. You can download an offline copy of the materials via the green button at https://github.com/github/training-materials/releases
+1. You can view and teach from the kit, hosted on GitHub, at http://training.github.com/kit
+2. You can download an offline copy of the kit via the green button at https://github.com/github/training-kit/releases
 
 
 ## Contribute
 
-We’re eager to have your help in improving these materials. If you have an idea for a change, start by opening a new [Issue](https://github.com/github/training-materials/issues) so we can discuss and help guide your contribution to the right location. If you have corrections or materials contributions, we'd be glad to receive them via a [Pull Request](https://help.github.com/articles/using-pull-requests). For materials contributions, we ask you to share in our mindset of minimalism.  We aim to keep the workbook and slides a synchronized pair.
+We’re eager to have your help in improving this kit. If you have an idea for a change, start by opening a new [Issue](https://github.com/github/training-kit/issues) so we can discuss and help guide your contribution to the right location. If you have corrections or kit contributions, we'd be glad to receive them via a [Pull Request](https://help.github.com/articles/using-pull-requests). For kit contributions, we ask you to share in our mindset of minimalism.  We aim to keep the workbook and slides a synchronized pair.
 
 The educational content exists in two top level directories:
 
-1. [`slides`](https://github.com/github/training-materials/tree/master/slides)
-2. [`workbooks`](https://github.com/github/training-materials/tree/master/workbooks)
+1. [`slides`](https://github.com/github/training-kit/tree/master/slides)
+2. [`workbooks`](https://github.com/github/training-kit/tree/master/workbooks)
 
 
 ## File Format
@@ -30,4 +30,4 @@ The majority of the site materials are written in [Markdown](http://whatismarkdo
 
 The build of this repository is fully automated through several shell scripts. To perform a build of the materials identical to that of our continuous integration server, from the top directory of this project, run `./_buildscripts/cibuild` and then inspect the output in the `_site` directory.
 
-The `_buildscripts/makerelease` script produces a zip bundle for offline use of these materials. Pre-built releases are available at https://github.com/github/training-materials/releases
+The `_buildscripts/makerelease` script produces a zip bundle for offline use of these materials. Pre-built releases are available at https://github.com/github/training-kit/releases