Restricted the ruby 1.9 build to json < 2 #350
Merged
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Version 2.0 of the json gem requires ruby 2+. We should continue
supporting ruby 1.9, but to do so we need to make sure that travis uses
version 1 of the json gem.
I've done this by adding a custom gemfile for ruby 1.9 that restricts
json to version 1.