Add support for forced refresh of cached page

Fix pagebuilder file cannot be not removed directly after being uploaded

Hide block categories without any matches

Do not init PHPageBuilder when no config is provided (during installa…

…tion)

Make PHPageBuilder config argument optional

Comment fix

Text align buttons added, fixing HansSchouten#15

Pass variable to block script indicating whether we are inside the pa…

…gebuilder

Fix loading issue in Chrome when GrapesJS inits before custom script …

…is loaded

Update style dist