added migration to fix legacy assets
added migration to fix legacy assets

riseuplabs/crabgrass,ajturner/crisiscommons,riseuplabs/crabgrass,adammck/crabgrass,ajturner/crisiscommons,nilclass/echosocial,geoiq/digitalgazette,riseuplabs/crabgrass,adammck/crabgrass,geoiq/digitalgazette,nilclass/echosocial,nilclass/echosocial,geoiq/digitalgazette,nilclass/echosocial,adammck/crabgrass,riseuplabs/crabgrass,geoiq/digitalgazette,ajturner/crisiscommons,adammck/crabgrass,ajturner/crisiscommons,riseuplabs/crabgrass,riseuplabs/crabgrass,riseuplabs/crabgrass