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Update the Travis configuration to switch to using Trusty and remove EOL and soon-to-be-EOL'd versions of Ruby.
Description
Builds have suddenly started failing whilst attempting to install the rugged gem. As part of investigating this I noticed our Travis config is really out of date and given Travis have no clear intentions of supporting Precise beyond March 2018 (only 3 days left) I thought it best to switch us to Trusty now.
This happens to have resolved the problem installing the rugged gem too 😄
Whilst I was at it, I've also removed testing against Ruby 2.1 as it is already EOL and 2.2 as it is EOL at the end of March too.
Removing the rest of the checklist as it doesn't apply.