Add 1.9.3-p448 headers
Add 2.0.0-p247 headers
Bump to version 1.2.3
Add 2.0.0-p353 headers
Add 1.9.3-p484 headers
Bump to version 1.2.4
Merge branch 'master' of git://github.com/cldwalker/debugger-ruby_core_source

Conflicts:
	lib/debugger/ruby_core_source/version.rb
Version bump