add 2.0.0p0 insns files and BSDL license file
Set optimizations false

details:

 * set and reset compile_option parameter

 * fix detector for NP_ALWAYS_FALSE in case that
   false variable become operator's argument
   such as "1+a"
Support ruby 2.0

NOTE:
 Rspec doesn't pass tests on ruby 2.0.0-p0,
 bacause of ruby's bug - Backport #7989.
 For details of #7989, see below link:

 https://bugs.ruby-lang.org/issues/7989