Updated vm/ to master.
Updated build system files from master.
Updated .bundle/config.
Added gemspecs for build, developer tools.
Updated .gitignore.
Added gems_list.txt.
Added Gemfile.installed.
Updated Gemfile and added Gemfile.lock.
DBL2NUM is not defined in 1.8.7.
Removed encoding reference in JIT.
Renamed File.exists?.
Added missing bootstrap rubysl-rational.