Add support for Russian and Portuguese

[JessRudder]

No description provided.

[coveralls]

Coverage remained the same at 96.505% when pulling a2c6c90 on JessRudder:add-language-support into c9c0ab9 on alexduryee:master.

[alexduryee]

Thanks for this! I'd like to have specs for each language supported by the library - could you add Portuguese and Russian dates to https://github.com/alexduryee/timetwister/blob/master/spec/dates_spec.rb#L620 ?

I realize now that August is a bad month to use for testing languages, since agosto appears in multiple languages. It's not necessary, but if you could change the month in the language test from August to anything else, I'd be eternally grateful.

[JessRudder]

@alexduryee absolutely! It'll be a few days before I can get to that (most likely). Will it work if I provide the tests by the end of this week?

[alexduryee]

@JessRudder Sure thing! Take your time; there's no rush, and I need to diagnose an issue on my end anyway.

Thanks so much for working on this; it's tremendously appreciated!