Add license.

Merge pull request #37 from est31/master

Cargo update

Update to lewton 0.6

Merge pull request #34 from est31/master

Require alloc only on mac

Use libc and log crates from crates.io instead through a feature

Fix race condition on fresh clone

Merge pull request #33 from est31/master

proc_macro got stabilized

More robust search for include path for mkvparser.hpp

Update num-derive to work with latest rustc

Update to use custom derive

Provide default impls for the AudioHeaders and VideoHeaders traits

Little simplification to prevent possible future combinatorial explosion