add bool/boolean type in "Pointers" section

merged from https://github.com/RubyMotionJP/RubyMotionDocumentation/pull/4
add section about editors
mention rubymine
typo
Merge branch 'master' of github.com:HipByte/RubyMotionDocumentation
Merge branch 'refs/heads/HipByte/master' into japanese