Ruby221, idempotent compilation steps#5

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duhast wants to merge 3 commits intojlund:masterfrom

Commits on Mar 26, 2015

Works with ruby2.2.1 on Ubuntu 14.10; Prereqs setup refactored; More compilation steps
duhast
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Commits on Apr 5, 2015

Symlinking updated
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Commits on Apr 6, 2015

Role version added (ref librariab-ansible)
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