Set the default value of set_background_auto(true)
Bind noise(x), noise(x, y), noise(x, y, z)
Change from mrb_define_method to mrb_define_module_function
Bind the funcitons of ofMath

dist
dist_squared
clamp
normalize
rad_to_deg
deg_to_rad
lerp
Add test/test_math.rb

Use at ofruby
Add test_dist, test_dist_squared
Bug fix & Add test_clamp
Bug fix & Add test_normalize
Add test_lerp
Unbind the normalize function because cause the possibility of zero
divide exception
Add help