Updated tab selection code & added a waning to setClickHandler if el is not found
Updated tab selection code & added a waning to setClickHandler if el is not found

Tab selection code will now fall back to the first tab if the specified
tab is not found.

setClickHandler will check for the existence of the click element and
throw a warning if it doesn’t exist to highlight initialization
problems.

austinsand/roba-tabs,austinsand/roba-tabs