Bump thread_local version and test on Rust 1.3.

[BurntSushi]

Fixes #206.

[Amanieu]

I don't think bumping the version number is necessary since Cargo will automatically pick up the new version.

[BurntSushi]

I think it's necessary to specify a minimum bound, otherwise it's not guaranteed that Cargo will pick up the new version? (e.g., If there's some other constraint on the version of thread_local in a build.) I might be misunderstanding though.

[alexcrichton]

Yeah this way regex say it's only compatible with 0.2.4 and above (which I believe is the correct case)

[BurntSushi]

@alexcrichton So, I hadn't merged this yet because I don't think it will build on Rust 1.3 on Windows. :P So I guess we technically support Rust 1.3+ on Linux and Rust 1.4+ on Windows.

[alexcrichton]

Gah oops! Sorry about that :(

Out of curiosity, is there one place these version dependencies are coming from? Or are they just for convenience?

[BurntSushi]

@alexcrichton I think I'm just sympathetic to the "your build just broke because a semver bump required a newer Rust." I don't think we have any policy on it yet, but maybe it's time to talk about it? :-)

[alexcrichton]

Yeah seems fine to me, I'll add an item to our agenda.