Fixes for rust nightly changes

[mokus0]

As described at rust-lang/rfcs#1184, rustc nightly now automatically imports core when using no_std

[mokus0]

Working on a few more updates, looks like things have changed even more since the nightly i did this fix for...

[mokus0]

Doesn't build cleanly due to rlibc, and I'm not currently set up to run the full travis test suite, but builds on my system as of today with rustc 1.4.0-nightly (f05b22efb 2015-08-15). There are a few more deprecation and unused-feature warnings, but I'm not 100% on those whether the right thing is to remove them, conditionalize them, or replace them with something else to achieve the same ends.

[farcaller]

can you please add std::hash::hash fixe there? (see travis)

[farcaller]

and thanks for getting us back on green again 😄

[mokus0]

sure, looking into it now

[mcoffin]

This will fix #336

[mokus0]

One more down. Looks like the "core" crate will need to be conditionally included for the "native" build. Gotta get some dinner and put the kids down for bed, but I'll fix that next.

[mokus0]

Ok, all green :)

[farcaller]

Thanks!