Fix fixnum_max for Opal. It should use the MAX and MIN value of Javascript Numbers specified in: http://www.ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer
Fix fixnum_max for Opal.
It should use the MAX and MIN value of Javascript Numbers specified in:
http://www.ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer

kachick/mspec,kachick/mspec,ruby/mspec,eregon/mspec,ruby/mspec