Add documentation to Comparable

Add Tests for all Exception classes, for false, true, Proc, Module, nil ...

Add ISO Test Cases for Kernel

Makefile mods

Teach mirb another way to quit

Add CMake support authorship miss

call mrb_close() in tools and test programs

Avoid warning: redundant redeclaration of ‘OnigEncDefaultCharEncoding’

Add CMake build infrastructure

I was hoping this would cause valgrind to complain less, but there is still
a lot of memory leaked (does mrb_close() actually free all of the managed
blocks?)  Anyway this helps somewhat and is good practice

Conflicts:
	src/time.c