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

As per monaka's comment here...
  https://github.com/mruby/mruby/pull/175
...changing these initializations of mrb_int values to use integer
constants

* mrb_time_gm() uses mrb_int
* Same for mrb_time_initialize()
* The parameters to time_mktime() are mrb_int, and that's what these values are passed to

So I don't see why mrb_time_local() works on mrb_float instead.  Lets make
it consistent with the other methods defined in time.c