Added option for slop protection (#730)
Added option for slop protection (#730)

I noticed when clicking around to move the cursor, it was too easy to
accidentally create a region. This addresses that issue.
katspaugh/wavesurfer.js,agamemnus/wavesurfer.js,ffxsam/wavesurfer.js,agamemnus/wavesurfer.js,katspaugh/wavesurfer.js,ale-grosselle/wavesurfer.js,ffxsam/wavesurfer.js,ale-grosselle/wavesurfer.js