Short GA edits
Merge pull request #38 from jjensenmike/quick_edit

Short GA edits
Add sldl_to_geoid. First cut, needs work.
Add scripts/discrepancies.py to double-check conversions
add output to make sense of no output
cleanup conversion
clean up numbering
allow per-state rebuilds
replace ma artifact
add upper mapping info
cleanup conversion
Add exception, missing district, start to build out exceptions
add exceptions properly, add dc wards to sldu
start cleaning up nh
mis-ordered nodes.
Add new Gaz files.
add hooks for sc
update ids to strip leading 0s
add exception for grand_isle-chittenden
Add in all SLDL and SLDU, except Maryland, which needs a tweak.