Add comments about the expected file system

Build the Java and MEX files
Setup the path

unit_test/RunAllTests.m

@@ -1,3 +1,11 @@
+% run the tests for Travis CI
+%
+% File system looks like this:
+%    robotics-toolbox-matlab
+%    robotics-toolbox-matlab/unit_test  ** WORKING folder
+%	 lib/toolbox-common
+%    lib/spatial-math-toolbox
+
 import matlab.unittest.plugins.CodeCoveragePlugin
 import matlab.unittest.plugins.codecoverage.CoberturaFormat
 import matlab.unittest.TestRunner
@@ -11,6 +19,23 @@
 plugin = CodeCoveragePlugin.forFolder('..', 'Producing',reportFormat);
 runner.addPlugin(plugin);
 
+% setup the path
+
+% for other toolboxes
+addpath ../../lib/toolbox-common-matlab
+addpath ../../lib/spatial-math
+
+% for RTB
+addpath ..
+addpath ../models
+addpath ../data
+addpath ../simulink
+
+% build the MEX file
+cd ../mex
+make
+cd ..
+
 % Run all unit tests in my repository.
 results = runner.run(suite);