refractured urls and raw.py
added normalization.py, ready for caiyao to modify
wrote grid_mappinginng.
add grid index finder to normalization.py
wrote the gridify API calls. depends on Caiyao normalization lib.
Merge branch 'data-normalization' of https://github.com/Pinultimate/pinultimate into data-normalization
merged with Caiyao, ready to test
fixed urls.py mapping issues. fixed Caiyaos normalization logical bug, needs Caiyao review. fixed API call bugs. Added features to prevent square region that crosses lon_index=0, i.e. lon_index wrapping.
Run more tests and confirmed Hongxia's change on normalization.py
merge data-normalization