Version 0.6.9

tagging fixed highlight

tagging small update

fix a NAN error that could occur if using center_widget if the grid w…

…as in responsive mode.

Error check the shift cols, to ensure they can't move left past col 1
make a change from 100% to 100VW for better browser support of min-width

dsmorse#3 Adds ability to automatically center widgets in the grid.

Release v0.6.3