Add first draft of "building a native extension"
Update "Native extensions" guide
Remove unncecessary markup
removed old native extensions
Merge pull request #37 from javiermolina1234/native_extensions

Native extensions
updated extension guides
jenkins auto-commit
Update "ruby extensions" guide to 4.0 and add instructions for
- adding extensions
- adding libraries
- adding 3rd party gems
Merge pull request #39 from javiermolina1234/extensions

Update "ruby extensions" guide
Merge branch 'master' of github.com:rhomobile/rhomobile-docs into rc-api
Fixing syntax