Improve support for parsing iso8601 dates

[friism]

RestSharp currently fails to parse DateTime formatted by Newtonsoft.Json.Converters.IsoDateTimeConverter. DateTime.Parse() does a pretty good job on these so I've added that as a last-ditch attempt. Alternatively, it should be attempted in JsonDeserializer.Map if no DateFormat is specified.

[johnsheehan]

+1 looks good to me

[petejohanson]

Is there a reason these assertions use string comparison instead of comparing the DateTimes directly?

[friism]

That's what all the other ones do and I wanted to do it the same way. Other than that, there's no reason. Should I compare directly?

[friism]

I've changed all comparisons to be more sane and removed some other whitespace stuff.

[pedrolamas]

I was just about to merge this change, but think something got broke regarding the tests, because GitHub now states "pull request cannot be automatically merged"; can you merge the current code version on the repository with your code and update the pull request?

[friism]

@pedrolamas That "something" was you changing the line-endings in the misc.cs file in this commit: pedrolamas@77befa1

That change seems unrelated to what was otherwise happening, it should have been in a separate branch, why did you add it?

At any rate, I've rebased this branch.

[pedrolamas]

I didn't change it knowingly, my Visual Studio must have done it for me and it slipped "under the radar" when I pushed the changes... :\

Sorry for the extra-work and thank you for the help!