Major post review changes
Merge branch 'master' into fetch-libraries-metadata
Moved UUID-generation to backend
Added h5pVersion in platforminfo
Avoiding json beeing cached both locally and on backend
Moving external file fetching out of core
Fixed usage of non-existent function
Merge branch 'master' of github.com:h5p/h5p-php-library
Merge branch 'fetch-libraries-metadata'

Conflicts:
	h5p.classes.php