false start . . .
added Everything to Gain, Fightball, Gaming Guardians,
High School Drama!, Nodwick, Unexploded Cow sets
Fixed error - extra (uncommented) INSERT INTO button line for Fightball
* add attribution for Button Men art
Merge pull request #522 from cgolubi1/521_attribution

* add attribution for Button Men art
Merge pull request #525 from ManvilleFog/504_add_official_bm_sets

504 add official bm sets