Cranium lacks proper prefixing

[knome]

All functions, macros and datatypes defined by cranium should have a prefix associated with them to avoid having cranium and another library's defined functions conflict during compilation.

For example, you defined MAX in FUNCTION_H, which may conflict with a differently defined MAX from another projects headers. Instead CRANIUM_MAX(...) should be used. You may want to do this with your template guards as well ( CRANIUM_FUNCTION_H ) to avoid a situation where a user would find your header or another library's header mysteriously not being included because both check for and define the same macro definition in their template guards.