Fix deprecation warning in simple_linear_interpolation#3198

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simgt wants to merge 2 commits intomatplotlib:masterfrom

simgt:deprecation_warning

Commits on Jul 8, 2014

Fix deprecation warning in `simple_linear_interpolation`
simgt
committed

Commits on Jul 9, 2014

remove float cast in `simple_linear_interpolation`
simgt
committed