method writing, roles and variables

[Paul Dufresne]

Jus some random notes.

To Lee:
===========
BlockNode inputVariables is an Array, and localVariables and freeVariables 
are Dictionary.
Is it normal, good?

Also, in sytax.slate I think, you walk through roles, doing ifNotNil, but in 
the parser,
when there is no role, we don't put Nil, but a LiteralNode with NoRole as 
value.
===========

I have just commited a version of writer.slate that have a more normal way 
of writing
methods. Just some spaces to remove, or add, and it should looks just like 
what we
use to write for methods.

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