the test task is executed twice in ci

[Thanood]

The ci task depends on ['default', 'coveralls']. Default executes test:

gulp.task('default', function(callback) {
  return runSequence(
    'lint',
    'build',
    'test',
    callback
  );
});

Coveralls depends on test:

gulp.task('coveralls', ['test'], function (done) {
  gulp.src('build/reports/coverage/lcov/report-lcovonly.txt')
    .pipe(coveralls());
});

for reference: aurelia-ui-toolkits/aurelia-materialize-bridge#85