Lesson names and descriptions updated for all levels in Japanese.

##Summary

- Translated into Japanese lesson titles without a "ja" version
- Retranslated old heading "rebaseをモノにする" to reflect current heading (previously under "INTL out of sync" comment)
- Added heading for advanced topics
- Translated "Cloning" intro lesson into Japanese.

(see screenshots below)

##Tests

All grunt tests passed with `grunt build`

##Other Changes

No other code changes performed.
All changes confined to "levels" files.

npm-debug.log added to .gitignore file.

![titles-11022014](https://cloud.githubusercontent.com/assets/6155643/4879505/dddc5fda-632b-11e4-8c2b-35c2ea33dccb.png)

![clone-lesson11022014](https://cloud.githubusercontent.com/assets/6155643/4879535/839c4d5e-632c-11e4-8e51-9dcda333f789.png)

##Future

If these are accepted, I'd like to continue to translate lessons.