Add Rails 5 support#134

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ddomingues wants to merge 3 commits intoassembler:masterfrom

ddomingues:add-rails-5-support

Commits on Aug 24, 2016

Add Rails 5 support
ddomingues
committed

Commits on Feb 3, 2018

Freeze the rails dependency to 5.2 version
ddomingues
authored

Commits on Feb 4, 2018

Update cloudinary version to 1.8
ddomingues
authored