Add initial version of IMPL.txt document
Merge branch 'master' of github.com:brownplt/lambda-py into multiple_inheritance
Merge branch 'master' of github.com:brownplt/lambda-py into multiple_inheritance
add PyImport and desugar to assigment [issue #2]
add IMPL file to module test
Update implementation documents
add PyImportFrom in surface syntax and get-strcutured-python; havn't desugar yet [issue #3]
desugar PyImportFrom [issue #3]
Update implementation document
desugar from x import * [issue #4]
Merge branch 'modules' of github.com:brownplt/lambda-py into modules
Implemeted builtin-type file. (closes #16)
Added notes to IMPL
Made globals a mutable hash.

By doing this we can't have CLet work on the global scope. Added a new
local env when CLet is used in global scope as a work-around, assuming
that there won't be any local bindings in let-body.
Lexical python, to which we desugar standard from standard python
syntax implemented
now this actually looks like lexical syntax
pushing inaugural lexical syntax
Change base to bases
Initial changes for multiple inheritance: base changed to bases,
but kept as list of symbols, not tuple of classes as it should be
to be able to implement type(name, bases, dict).
Adapted test_mro_disagreement.py to use class statement instead of
type(name, bases, dict).
Temporarily implemented type(obj) as a function, not an object.
Fixed error in ___fail() to match py-prelude.py
typos corrected