Added stb_perlin benchmark

    * configure: Regenerated
    * configure.ac: Added stb_perlin benchmark
    * src/stb_perlin/Makefile.am: Makefile.am for stb_perlin
    * src/stb_perlin/Makefile.in: Generated
    * src/stb_perlin/stb_perlin.c: Benchmarking perlin noise generation
Merge branch 'jp' of ssh://github.com/mageec/beebs into jp
Rewrite LDFLAGS configuration for stb_perlin to avoid overriding AM_LDFLAGS

    * src/stb_perlin/Makefile.am: Rewrite to add LDFLAGS to AM_LDFLAGS
    * src/stb_perlin/Makefile.in: Regenerated
Make stb_perlin self checking and fix some bugs, including array out-of-bounds
access. Adjusted SCALE_FACTOR to a reasonable timeframe.

    * src/stb_perlin/stb_perlin.c: Fixed array access bug and made benchmark
        self-checking.
Merge pull request #6 from ks07/jp

Added perlin noise generation benchmark