Upgrade ruby-oci8 gem [#75219]
Use the first of the array of MIME::Types [#75219]

MIME::Types.type_for should always return an array, but it seems 1.9.x was
stringifying differently. This takes the first value and explicitly stringifies.
Remove Float assertion [#75219]

If :total_cost is incorrect, the to_percent assertion a few lines down should fail.
Work around Float issues between Ruby versions [#75219]
Merge pull request #180 from tablexi/75219-ruby-upgrade

Upgrade to Ruby 2.1 [#75219]