Issue #1611 and #1637, combining and renaming service animal and assistive device fields
Issue #1611 and #1637, migration fixes
Issue #1638, Rename "Mobility Impairment" to "Service Level"
Issue #1612, removed service animal as a filtering option
Issue #1612, added service level to eligibility requirements filtering
Issue #1612, added some explanatory text about multiple eligibility groups
Merge pull request #9 from rideconnection/filtering_changes

All filtering changes EXCEPT for removing the mobility accommodations system.