typo fix

`elements with and anchor` -> `elements with an anchor`
Merge pull request #2881 from case/patch-1

typo fix
update license copyright
fix typo
Merge branch 'master' of github.com:zurb/foundation
Fixed typo on Abide page
Close background on touchend in reveal.
Remove alert.
convert index to an int, otherwise index+1 will be a string concatenation, closes #2915