add perl versions, remove hard-coded dependencies

[cakirke]

• enabled testing on 5.14 and above versions vs. only current version
• leverage dependency install from Makefile.PL vs. static list in .travis.yml
• updated dependencies to get clean build

results available here:

https://travis-ci.org/cakirke/attean

[kasei]

Very cool. Didn't know you could test multiple perl versions in a single configuration.

[kasei]

Thanks!