Denver-based development companies MVG Development Inc. and Confluent Development Services will merge into one company Monday, and will do business under the Confluent name. Confluent Development was founded by Marshall Burton and Celeste Tanner, both formerly with The Opus Group, about a year ago. The company has specialized in industrial and office projects, with about $150 million in development projects currently in the works in metro Denver. Confluent's projects include a 25-acre technology…