Build documentation for *docs.rs* website

[alexreg]

Let's make sure Travis does this automatically too.

[musoke]

Is this to check that the docs can build? As far as I know, docs.rs automattically builds the documentation when updates are pushed to crates.io.

However, docs.rs does seem to have failed to build the docs so far. All using rustc 1.17.0-nightly (0f34b532a 2017-02-21)

[pkgw]

Yes, I think the docs will not build on docs.rs because of Tectonic's dependencies on various native C libraries. I am not sure of the best way to deal with this. But this connects to the larger challenge of making Tectonic build more comfortably within the Cargo/Rust ecosystem (cf #15).

[alexreg]

Ah yes, you're right about that @musoke. Maybe docs.rs can somehow be told to ignore the native dependencies though, when generating docs? I can have a look into this at some point, perhaps.

[musoke]

Didn't dig too deep, but here are some relevant links:

• https://github.com/onur/docs.rs/pull/73 (would fix this issue?)
• https://github.com/onur/docs.rs/issues/93

[alexreg]

Yes, I believe 73 would fix the issue, and be the more elegant solution.

[pkgw]

I've just published version 0.1.6 of the crate, and confirm that we're now available on docs.rs!