Add Ubuntu PPA information.
Add Ubuntu PPA information.

curalate/tablesnap,apigee/tablesnap,JeremyGrosser/tablesnap,russss/tablesnap,juiceblender/tablesnap,JeremyGrosser/tablesnap,heroku/tablesnap,juiceblender/tablesnap,amorton/cassback,betable/tablesnap,ethanmiller/tablesnap,russss/tablesnap,tamsky/tablesnap,apigee/tablesnap,betable/tablesnap