Remove unused variables in examples
Remove unused variables in geom
Remove unused variables in interactions
Remove unused variables in parsers
Remove unused variables in renderers
Remove unused variables in sources
Remove unused variables in sphere
Remove unused variables in structs
Remove unused variables in tile range
Fix typo in ol.style.Icon
Enable all gjslint errors
Add missing semicolons
Use === and !== for comparisons with 0
Merge pull request #722 from twpayne/unused-variable-check

More rigorous linting