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f4d0164607
1. Add a line search based minimization loop. 2. Currently this loop supports steepest descent and three kinds of non-linear conjugate gradient algorithms. 3. Update SolverImpl to talk to LineSearchMinimizer. 4. Update IterationCallback to carry information about line search. 5. Update LineSearch to take the initial point as input, saving on one function evaluation. 6. Updates to the external API. Change-Id: I901a0e89fc948451ab34c743e70f3dec57c9405e