move boilerplate to tools
remove unused EVENTSOURCE
remove unused [FILESYSTEMAPI]
remove unused pingback
remove more unused references
adding images for alt section
update A link or button containing only an image

first pass for review!
new image file
fixed up code of last alt commit
changed image from jif to ping
added button example

also added button image
tweaked exampce code
[giow] (2) Work on dir=auto. More work may come.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=17835
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7863 340c8d12-0b0e-0410-8428-c7bf67bfef74

No objections on public-html, so taking this additional cherry-pick from Week 18 changes.
crocoduck images
update 'group of images' advice

initial pass on 'A group of images that form a single larger picture
with no links' and 'A group of images that form a single larger picture
with links' for review
crocoduck lives!
cleanup bad code
more cleanup
Fixed retarded undefined null
whoops forgot to merge first
updated images of text sub section