Pasadena-based Cramster, the online homework help site started by Aaron Hawkey, Robert Angarita and Kaveh Golabi, has been acquired by Chegg, Chegg announced today. Financial terms of the buy were not disclosed. Chegg said the acquisition will add to Chegg's textbook rental and course planning services. Cramster is an online community of users interested in discussing homework; getting homework help; and practicing for tests. The firm had raised around $9M in funding, from Primera Capital and Shai Reshef. Chegg said Cramster has more than one million members on the site.