Mortis69/rendera — pull request #25 by rubicks (2014-10-25 07:17:07+00:00)
Title: adds sort_by function template and uses it in Palette and Quantize

adds:
* ```sort_by.H``` ... declares/defines function template ```sort_by```

modifies:
* Quantize.cxx ... to use ```sort_by```
* Palette.cxx ... to use ```sort_by``` via new anon namespace function
* Makefile.am ... adds ```sort_by.H``` to ```rendera_SOURCES```