example title change
gallery effects,icon change,cleanups
typo fix and heading changes
fix indentation error-cause lots of build warnings
4 thumbs per row/hover effect/some cleanup
fix for iris dataset
line_count sort added, some changes reverted
move comment out of list
remove comment, undo change
rename example title
Merge pull request #1581 from jaquesgrobler/example_gallery_cleanup

MRG Example gallery cleanup