This morning G2, a company that provides an online software review and information database, announced that it has raised a $157 million Series D. Per a release the company shared with TechCrunch in advance of its news, G2 is now worth more than $1 billion, making it a unicorn in modern parlance. Permira led the round via its growth fund, while prior venture capital firms IVP, Emergence, and Accel also contributed. The investment also included capital from LinkedIn, which previously invested, and corporate venture dollars from both HubSpot and Salesforce….