LRDOCS-532 URL title optimization
LRDOCS-532 Documentation Guidelines Update
LRDOCS-532 Update NumberHeaders to resolve StringIndexOutOfBoundsException's
LRDOCS-532 Allow NumberHeaders to handle duplicate headers of any size
LRDOCS-532 Resolve char length inconsistencies for header IDs
LRDOCS-532 Refactor logic, refresh .jar, and convert slashes to dashes
Add 'clean' as dependency for 'dist' target in liferay-doc-utils/build.xml
Merge pull request #536 from jhinkey/LRDOCS-532

LRDOCS-532 Improve URL title generation for 6.2.x