phobos commit, revision 1521


user: rsinfu

msg:
Changes on std.traits:
- ReturnType and ParameterTypeTuple now accepts property functions.
- Added ParameterStorageClassTuple, functionAttributes, functionLinkage, variadicFunctionStyle, FunctionTypeOf.
- Added isUnsigned, isSigned, isTypeTuple, isSomeFunction, isCallable.
- Added OriginalType, Signed, mangledName.
- Made Unqual aware of shared and shared-const qualifiers.

http://www.dsource.org/projects/phobos/changeset/1521