Updated examples rakefile
 *  Build directory created if it doesn't exist. This fixes a gcc "no such file or directory" error when running rake
Merge pull request #49 from uozuAho/master

Fixed examples build error (rake)
Allow pointer types to have an attribute

Microchip's XC16 and friends, when used with dsPICs, require that all pointers
to memory which could possibly be in EDS space by adorned with __eds__, e.g.

    __eds__ int* p_int

Adding the macro UNITY_PTR_ATTRIBUTE allows Unity's pointers to be decorated
with whatever ridiculous attributes the compiler requires.