Binary "type ID" on public API.

[Vladimir Ozerov]

Folks,

We have several public methods which operate on "type ID" concept:

   - IgniteBinary.typeId(String typeName)
   - IgniteBinary.metadata(int typeId)
   - BinaryType.typeId()

These methods came from initial GridGain portables implementation where it
is possbile that there is no type metadata so ID is the only way to operate
on the type.

In Ignite we *always* have type metadata. So I think we can safely remove
mentioned methods.

Thoughts?

Vladimir.