Move javadoc from 4.6 to 4.6.0 for consistency
Add v5 javadoc (CM 4.7.0)
Add v5 api docs
Migrate to multi-page documentation

Moved to a real Jekyll + Liquid + Markdown multi-page site.
Using bootstrap v3 for styling.

Added new contents:
- CM concepts
- Python install and examples
- Debugging tips

See README.md for more.