Drop Oj as a dependency

[roooodcastro]

Is there any reason that this gem must have Oj as a dependency?

I know it speeds up JSON generation, but if it's not strictly necessary, it should be removed. I work on a project that can't have Oj installed, due to some specific JSON interactions between other gems and services. What I had to do was to manually set MultiJson to ignore Oj and use the default JSON adapter, but that's not ideal.

Would you consider dropping Oj as a dependency here?