Moved both get_num_instances_for_*let to a single Extension.get_max_instances.
Fix problem with out of date extensions getting loaded improperly
Making point version in required extension version optional
Moved both get_num_instances_for_*let to a single Extension.get_max_instances.
Making single instance the default for all extensions
Merge pull request #1905 from Lusito/maxinstances

Moved both get_num_instances_for_*let to a single Extension.get_max_instances
Merge pull request #1906 from Lusito/extensionfix

Extension Load Fixes
Merge branch 'master' of https://github.com/linuxmint/Cinnamon