store immutable struct's field values inline
add struct's field mapping to avoid data duplication
add a comment to map() method in W_Struct
replace temporally comment with docstring
replace temporally comment with docstring
make the struct functions stop using W_SimplePrim

write a new decorator that simplifies that task
Merge branch 'master' into structs

Conflicts:
	pycket/prims.py
	pycket/struct.py
Merge branch 'master' into structs

Conflicts:
	pycket/struct.py
Merge branch 'structs' of github.com:samth/pycket into structs

Conflicts:
	pycket/struct.py
struct's predicate should be able to accept all objects as an argument
return W_SimplePrim implementation (no need for changes anymore in struct's classes)
Merge branch master into structs