Travis: Start sending e-mail notifications

Prerequisites

1. Make sure Travis CI have access to your GitHub repository. Head over to our documentation for details on setting up Travis CI.
2. Fetch the testing branch:

   git fetch git://github.com/vmdef/moodle testing-travis

3. Create a new local branch:

   git checkout -b testing-travis FETCH_HEAD

Test 1 - Email notifications disabled

1. Define an environment variable in the Travis repository settings (Travis documentation) to turn off email notifications:

   name	value
   MOODLE_EMAIL	no

1. Push the new branch to your GitHub repository (github is your GitHub remote):

   git push github

2. Wait until the build tasks end.
3. Confirm that you don't receive a notification email from Travis with the build result.

Test 2 - Email notifications enabled by default

1. Remove the environment variable created in the previous test (step 1).
2. Add an empty commit:

   git commit --allow-empty -m"empty commit"

3. Push the new commit:

   git push github testing-travis

4. Wait until the build tasks end.
5. Confirm that you do receive a notification email from Travis with the build result.