Serde wrapper to serialize and deserialize Duration and SystemTime

[tailhook]

This PR supersedes #2

[tailhook]

Ping @sfackler

[tailhook]

@sfackler any issues remaining?

[xoac]

For anyone who want use this PR add in [dependencies]. But I hope for version 0.2 soon :)

serde-humantime = { git = "https://github.com/tailhook/serde-humantime", branch = "serde_wrapper" }

[tyranron]

ping @sfackler

[jean-airoldie]

@tailhook This repo seems dead. Do you mind if I try to merge your branch as a feature directly into humantime?

[tailhook]

Well, I prefer not to do that. Extra dependencies are always bad. And it's better a separate crate than a feature flag I think. Maybe just invent a new name for a crate? :)

[jean-airoldie]

@tailhook Sorry, I didn't realize you were the original author of the crate.

[tyranron]

@jean-airoldie nope, the badge indicates the author of pull request. Quite misleading sometimes ¯\_(ツ)_/¯

[jean-airoldie]

@tyranron I mean that humantime is tailhook's crate, so because he is filling a PR for this crate (as opposed to his) my question was spurious.

[jean-airoldie]

Ended up creating a new crate.