0.11.0

AST changes to reflect changes in rustc

• Rename ExprKind::Vec to ExprKind::Array
• Change the content of ExprKind::Closure from a Block to Expr
• Support expression values for break statements
• Support attributes on fields in a struct literal expression (FieldValue) and pattern (FieldPat)
• Add a new type of where predicate - EqPredicate
• Combine Ty::ObjectSum and Ty::PolyTraitRef into Ty::TraitObject
• Add Ty::Mac to support macros in type position

Other breaking changes

• Remove the custom-derive registry that was used for expanding derives on stable rust; real custom derives will be stable very soon
• Unify BlockCheckMode and Unsafety (#66, thanks @shepmaster)

Non-breaking changes

• Rename parse_macro_input to parse_derive_input and MacroInput to DeriveInput now that there are other types of procedural macros that are not derives; the old names will continue to work because they have appeared in so many Macros 1.1 guides (#63, thanks @SimonSapin)
• Support parsing macro invocations that use namespaced paths like a::b!(...)
• The AST walker syn::visit::Visitor now supports all AST types (#79, thanks @mystor)