Travis stops the task after 50 minutes

[viferga]

Travis fails after 50 minutes building because it only has one tasks (build all docker images) and it takes too long for the travis limits (https://docs.travis-ci.com/user/customizing-the-build/#build-timeouts).

This needs to be solved in order to allow proper builds (https://github.com/metacall/core/blob/develop/.travis.yml).

There are two possible solutions (maybe more):

1. Split all tasks in other jobs in order to avoid reaching the job timeout.
2. Use pulled images from docker or similar, and build with docker scripts.

[viferga]

Mitigated with ceb26a2