Different time parsing functions used in library vs test code

[netrounds-fredrik]

The use of the arrow library was removed in #40 (#38), but then re-added in for the tests in f50cad5. So currently the m3u8 library and it's tests are using different time parsing functions.

Is there a reason for doing this?

[leandromoreira]

I don't know if there is any reason, can @Neon-Dlea help us here? ;) Anyway I think we should at least use the same time parsing functions, thanks @netrounds-fredrik

[flavioribeiro]

Yep, mind sending a PR removing arrow from the tests and requirements-dev?

[mauricioabreu]

Related PR: #134

[mauricioabreu]

@netrounds-fredrik sorry for the late reply

I guess the problem was Python compatibility. Python 2.6/2.7 did not have an easy way to compare dates with timezones. To solve it I created a class to represent a tzinfo to construct a timezone aware date. Thank you for opening this issue!