patch for pinch zoom point.  initial two point touch midpoint is used for duration of pinch-zoom operation.  references #17
Merge pull request #21 from openseadragon/pinchzoompoint

patch for pinch zoom point.
Added "grunt publish" command for copying to site-build
Fixed a bug with "grunt publish"; was using the wrong paths
Upped version number to 0.9.121
found typo in source, thie was supposed to be this
Merge branch 'master' of https://github.com/openseadragon/openseadragon
Merge branch 'master' of https://github.com/openseadragon/openseadragon into fullscreen