Fix typo "gihub" in libsyntax/crateid.

Update licensing header for 2014.
librustc: Try to resolve before coercions.
auto merge of #14627 : Indiv0/rust/fix-crateid-doc-typo, r=alexcrichton

Example URL in CrateId documentation is:

    `gihub.com/mozilla/rust`

Instead of:

    `github.com/mozilla/rust`

Also update libsyntax/crateid.rs licensing header for 2014.
librustc: remove check::FnKind enum since we only ever use one variant.
auto merge of #14632 : luqmana/rust/cu, r=huonw

The distinction doesn't make sense any more since we don't have do blocks anymore.
auto merge of #14628 : luqmana/rust/fcr, r=nikomatsakis

#14589.