Merge branch 'release/1.5.2' into develop
Updated Pii to use Flexistore caching which is self-flushing
Removed two unused classes. Updated copyright header on all files.
appstore created on demand
merge
update for memcache use
Updated persistent cache to use memcache if available
fix for no memcache available
composer update
config cache cleanup
Allow Platform::getPrivatePath() to determine storage location vs. old logic
Current work checkpoint. See diff for details.
correct private app.store constant
rp
Merge branch 'release/1.5.3'
Merge tag '1.5.3' into develop

Release v1.5.3
composer update
rp
Merge branch 'release/1.5.4'