ENV-based login/pass/encryption set

[EugeneIstomin]

This pull introduces/changes:

• Add possibility to set login, password, encryption on/off for using migration in non-Rails projects

[codeclimate[bot]]

Code Climate has analyzed commit aca9026e and detected 1 issue on this pull request.

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[klobuczek]

Thanks @EugeneIstomin . Have you considered extracting this https://github.com/neo4jrb/activegraph/blob/master/lib/active_graph/railtie.rb#L82-L85 out of railtie.rb? There are many configuration options. Creating an environment variable each time someone needs one of those options doesn't seem like a sustainable solution. It would be great to solve the problem for any possible configuration.