Merge pull request #311 from ArjenSchwarz/master

Instapaper fixed the timestamps in their RSS feed
Fixing levenshtein requires
Merge branch 'master' into develop

* master:
  Instapaper fixed the timestamps in their RSS feed
version bump
Merge branch 'release/2.1.14'

* release/2.1.14:
  version bump
  Fixing levenshtein requires
levenshtein fix for multiple Ruby versions