Fixed missing parameter "$target" in watermarkImage hook (#67)
Fixed using $this in static method in IsotopeFrontend::loadPageConfig()
Consider the save_callback in the "quick-edit variants" form (see #519)
Do not filter products if everything is allowed (#125)
Set array(0) for root filter (instead of empty array) (#125)
Merge branch 'release/1.4.0' into develop