Cleaned up Travis file by moving to a helper script

[Cxarli]

Can't get enough of this project, so here's another PR. Not really an issue, but I thought it would be nice :smile:

[Razican]

Hi! thank you for your contribution once again. We will check and see if this is needed. The idea of having it centralized in a travis.yml with a declarative language sounded good enough, without being required to add a shell script. We well think about it though. Could you check what is happening with the builds in any case?

Thanks!

[Cxarli]

Whoops, made a typo. Should be fixed :smile: My foremost reason for putting it in a shell script, is that you can run a linter over the code to see if something is wrong with it. Another (small) benefit is that you can specify a shebang (#!/bin/bash) to indicate the shell, to fix edge cases where someone would use the travis script on a csh-based shell (Even though that's highly unlikely)

[codecov[bot]]

Codecov Report

Merging #131 into develop will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #131   +/-   ##
========================================
  Coverage    53.65%   53.65%           
========================================
  Files            6        6           
  Lines         2479     2479           
========================================
  Hits          1330     1330           
  Misses        1149     1149

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