exported image has incorrect center

[gavinduffy2]

i am using canvas.toDataURL(), the output shows the correct display for different zooms, however, if i pan the map, the output does not reflect the new center

[gregrowles]

code needs revision; latest version of leaflet causes the plugin to pull incorrect tiles for screen coordinates; calculations are out, by a lot

[gregrowles]

Upon further testing, looks like it works best when zoom level is using whole/round numbers....