FFI Doc: Chapter about callbacks#11486

Merged

bors merged 4 commits intorust-lang:masterfrom

Matthias247:doc

Jan 21, 2014

Commits on Jan 11, 2014

Introduced a chapter that describes how to perform callbacks from C to Rust
Matthias247
committed

Commits on Jan 12, 2014

Commits on Jan 20, 2014

Disabled the tests for the new code blocks
Matthias247
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