WooCommerce Lightspeed POS Integration 2.15.1

* Syncing Sale price now available (see documentation)
* Bugfix where single-store Lightspeed accounts do not get initialized correctly
* Bugfix where prices were being rounded down (i.e. 9.99 to 9.00)
* Bugfix where bulk import & sync would cause a "Something went wrong" error

* Bugfix where ancestor categories were not being applied to an imported Lightspeed product
* Bugfix where "same name" categories would not get imported
* Bugfix where the category column on the import page was not linking to the right category
* Bugfix where the "percent complete" value was incorrect when loading products from Lightspeed
* Bugfix where the "Load Lighspeed Products" button was not disabled correctly
* Bugfix where the "Import Categories" button was being displayed incorrectly

* Fixes a JS bug that broke the "Load Products from Lightspeed" button