Acquia, a digital services company based in Burlington, announced Tuesday it has closed a $50 million financing round led by a new investor, Maryland-based New Enterprise Associates. The new financing brings Acquia’s total investment funding to $118.6 million, from investors including Waltham-based North Bridge Venture Partners and Boston-based Sigma Prime Ventures. Acquia provides cloud hosting and related tools and services for websites created using Drupal, a free, open source web development software. Clients include Maxim Magazine, Connecticut-based watch company Timex, Bentley University in Waltham and the Grammy Awards.