Content:
- Rename Conditional{Conversion=>Converter}
- Add @since tags where appropriate
- Update Apache date headers to read 2002-2012 (not just 2012)
- Correct minor Javadoc typo
Style:
- Polish line breaks / whitespace
- Use wildcard static imports where appropriate
Issue: SPR-9566, SPR-9692, SPR-9928, SPR-9927