--HG--
rename : examples/image_ex.cpp => examples/fhog_ex.cpp

representation.

about how they schedule their initial step sizes.  In particular, they will try
to take step sizes that are similar to previously used sizes via a trust region
style scheduling.

backtracking_line_search() by making it use 3rd degree polynomial interpolation
after the first step.  Also made it more robust to alpha inputs with improper
signs.

computations done in f() when computing der().

tests so they work on older versions of visual studio.

that allow you to easily set uniform upper and lower bounds.

functions with the optimization code and forced the use of function pointers.
This was to avoid triggering a bug in gcc 4.0.  Since that compiler is no
longer officially supported by dlib I've removed these checks to increase
usability.