Update Ceedling to v 0.31.0.

Add some useful articles and minor corrections to documentation.

Author: mvandervoord

Dockerfile

@@ -16,7 +16,7 @@ RUN apk --no-cache add \
 ## Notes:
 ## - Gems must be downloaded manually to the vendored assets/gems directory.
 ## - To find the list of gems and versions needed, visit
-##     https://rubygems.org/gems/ceedling/versions/0.30.0/dependencies
+##     https://rubygems.org/gems/ceedling/versions/0.31.0/dependencies
 ## - The easiest way to vendor a gem is `gem fetch <name> -v <version>` in assets/gems.
 ##
 

README.md

@@ -1,9 +1,10 @@
 # Mad Science Lab C Unit Testing Docker Image
-Cross-compilation C unit testing environment with Unity, CMock, and Ceedling.
+C unit testing environment with Unity, CMock, and Ceedling. The purpose of this docker
+image is to create an easy-to-install portable system for running unit tests with Ceedling.
 
 ## Contents
 * Testing tools
-  * [Ceedling](http://www.throwtheswitch.org/ceedling) 0.30.0
+  * [Ceedling](http://www.throwtheswitch.org/ceedling) 0.31.0
   * [CMock](http://www.throwtheswitch.org/cmock) 2.5.2
   * [Unity](http://www.throwtheswitch.org/unity) 2.5.1
 * C support
@@ -19,3 +20,6 @@ Cross-compilation C unit testing environment with Unity, CMock, and Ceedling.
 ## Usage
 `docker run -it --rm -v <local project path>:/project throwtheswitch/madsciencelab[:tag]`
 
+## Basic Articles Discussing Unit Testing
+  * This docker image uses Ceedling to build "native" code as described [here](http://www.throwtheswitch.org/build/which)
+  * For additional help and tips for building native tests, read [this](http://www.throwtheswitch.org/build/native)