Revert "Fix #58 by importing SumVariationalStrategy in variational init"
Revert "Fix #58 by importing SumVariationalStrategy in variational init"

This reverts commit f0c1965794835eae0a52a6fd6f6906a7726722d5.

jrg365/gpytorch,jrg365/gpytorch,jrg365/gpytorch