Allow dom element as well as selector

Fixes: #9

This changes mirrors the options in LiteList and keeps this from
failing when the caller specifies a dom element during LiteList
construction
Don't cancel/stopPropagation when unnecessary

Fixes #10

Only the preventDefault during drag is needed here.  After additional
testing (still needs more on a wider variety of touch devices) behavior
seems appropriate with these removed.
Update bower dependency for rivets to 6.8
Update package version to match package.json