 MoneyGram International announced on Wednesday that customers can now purchase bitcoin with cash and withdraw bitcoin holdings converted to cash from its thousands of brick-and-mortar locations nationwide. The move is just the latest signal that bitcoin is becoming more mainstream. MoneyGram partnered with cryptocurrency exchange and bitcoin ATM operator Coinme for the endeavor. Through the collaboration and its other efforts, Coinme said which it be able will power more than 20,000 physical locations. 