SchoolSets now populate based on all states currently in view

Map now populates SchoolList with all schools in states located at all corners and the center of the map
Fixed Geocoding getState

getState now parses Geocoding JSON more reliably

SchoolSet.populate() now checks for empty strings in the set of given input
Added education API key for wind to Common.java
Merge branch 'Tweak_Geocoding_calls' into dev