Build Perl if needed to test whith most used versions #622
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Bug fix with feature
Perl 5.18 is not any longer available in a precompiled version from travis ci.
Tests are currently failing because of this
To prevent errors when travis removes support for a perl version, a perl helper (https://github.com/travis-perl/helpers) is used to use a precompiled version or compile a version if needed.
The used perl versions for testing are aligned to the most used from fhem statisics which are 5.26, 5.24, 5.20 and 5.14.
5.14 tests hangs but is allowed to fail.
If this issue can't be fixed i'll remove it from supported version.
Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
Other information:
This PR just changed the way, how perl is installed for the unittests