Added system test directory structure for c source files, tests, and build output.

Set up svn:externals for Unity C unit test framework and CException library.

git-svn-id: http://cmock.svn.sourceforge.net/svnroot/cmock/trunk@7 bf332499-1b4d-0410-844d-d2d48d5cc64c

rakefile.rb

@@ -4,8 +4,9 @@ require 'rake'
 require 'rake/clean'
 require 'rake/testtask'
 
+CLEAN.include('test/system/build/' + '*.*')
 
-task :default => [ 'tests:all' ]
+task :default => [ :clobber, 'tests:all' ]
 
 namespace :tests do