Small changes to DB naming structure

Rename table faction_groups -> factiongroups
Rename games_history column player?_factiongroup ->
player?_factiongroup_name
Added columns player?_faction_logo and player?_faction_color to
games_history table
Updated db_test_data to reflect changes to DB
Added factions images referenced in test data
Update admin.html and api to reflect changes

Added file upload for faction logo to admin.html