[CI] Move the "simple-phpunit install" command to Travis install section to collapse the output

[dbu]

travis-ci shows all output from the script section, but collapses the output of the install section. simple-phpunit uses composer to install the phpunit dependencies, producing a bunch of output that is usually not relevant.

[sebastianblum]

@dbu I think coverall integration is broken:
it should be if [[ "$ENABLE_CODE_COVERAGE" == "true" && "$TRAVIS_EVENT_TYPE" != "cron" ]]; with == instead of != in the section before_install of .travis.yml

Can you change it or should I open an pr?

[robfrawley]

@sebastianblum If you don't mind, open a PR. I try to keep PRs focused on their titled purpose, instead of adding other unrelated fixes. If you don't get around to it, I'll take care of it.

[dbu]

thanks.

can we merge this one?

[robfrawley]

Thanks @dbu!