Tasks completed:
1. Locate ConsoleLauncher output
2. Check if actual and expected of AssertionFailedError are both type of CharSequence
To do list:
1. Add diff function dependency
2. Using diff to generate the output desired

Issue: junit-team#3139

Tasks completed:
1. Locate ConsoleLauncher output
2. Check if actual and expected of AssertionFailedError are both type of CharSequence
3. Add diff function dependency
4. Using diff to generate the output desired

Issue: junit-team#3139

delete one line of extra code

Fixed different profile issue.

Tasks completed:
1. Locate ConsoleLauncher output
2. Check if actual and expected of AssertionFailedError are both type of CharSequence
3. Add diff function dependency
4. Using diff to generate the output desired

ToDo:
1.Automatic test case for diff output

Issue: junit-team#3139

Issue: junit-team#3139

Add external diff module  to module documentation
For unknown reason, the test cases can not find the external module while the gradle can build normally.

Issue: junit-team#3139