Changed to fixed position for mask.
Remove code preventing cross-domain requests, better handled outside Xhr
Merge pull request #19 from jmfee-usgs/allow-cross-domain-ajax

Remove code preventing cross-domain requests, better handled outside Xhr
0.0.10
Merge pull request #17 from emartinez-usgs/PosFixed

Changed to fixed position for mask.
0.0.11
Changed this.el to this._el to normalize use across all projects
Updating references from el to _el