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
Merge pull request #9 from KevBelisle/issue_8

Issue 8