Reorder homepage

Swapped Neighborhood column with Top Five/Recently Reviewed/Recently Added column
Update README.md
Update gitignore
Stop missing veg level from crashing the map js

Vendors missing veg levels will get coerced to 0. We are labeling
zero as "omni". We need to coerce to something because veg level is
an numeric data type and with the way templates fail silently, it is
occasionally empty.
Update README.md
Merge pull request #139 from ah2455/topic/reorder_homepage

Reorder homepage
Merge pull request #140 from steventlamb/bug/fix_map_js_veg_level

Stop missing veg level from crashing the map js
Merge remote-tracking branch 'upstream/master'