Merge pull request #11 from jrk/master

A few small Halide tweaks
Schedule Halide functions by internal name

The autotuner now builds a map of Halide-internal name to function object
which it uses to access functions by Halide name for scheduling. This
avoids the problem of requiring names used by the tuner to all be visible
as in-scope C objects pointing to the corresponding Func at the
AUTOTUNE_HOOK point.
Merge pull request #12 from jrk/halide-schedule-map

Schedule Halide functions by internal name
halidetuner: Reference funcs by name in all places
halide: Update apps/wavelet for reference-by-name
halide: Progress towards making interpolate work

It seems to have been out of commission since at least 2013-09.
halide: Increase input size for blur
halide: Fix bilateral_grid test app

It was using an outdated syntax for implicit arguments
halide: Increase bilateral_grid input size