WIP: Frontend tools from Drupal Lamp

[AronNovak]

Status

Changed the code to not install available tools globally again.

Todo

Tests, possible further optimizations

will fix #117

[AronNovak]

So we could make one step further, but:

Instead of ~8min WDIO exeuction, we have ~7 minutes. The bottleneck is ultimately downloading the Docker images:

It takes ~4 minutes to download Drupal Lamp and Zalenium.

What I find more interesting:
https://docs.travis-ci.com/user/migrating-from-legacy/#Why-migrate-to-container-based-infrastructure%3F

https://docs.travis-ci.com/user/migrating-from-legacy/#Better-network-capacity%2C-availability-and-throughput

• getting rid of sudo in .travis.yml could help us to download docker images , i will give a quick try here on this PR, as alone merging this does not seem to provide a big benefit

[AronNovak]

As no significant improvement could be achieved, closing it without merging. Making it sudo-less did not help with the execution time basically.