add ifvisible to readme
add ifvisible.js detection
Fixed issue where library icons appear cut-off
Removed outline box applied on first library name
Merge pull request #36 from serkanyersen/master

adds ifvisible.js detection
Merge pull request #38 from tancnle/fix-icon-cut-off

Fixed issue where library icons appear cut-off
Merge pull request #39 from tancnle/fix-outline-box

Removed outline box applied on first library name
dc.js detection
merge conflicts