Merge tag 'v1.3'

v1.3
Merge tag 'v1.4'

v1.4
Merge tag 'v1.5'

v1.5
Remove blank node prefix and replacement.
Disable broken and useless query 'optimization'.
Revert "Remove blank node prefix and replacement."

This reverts commit 752e19828fe60d28b038a5564163d0bdbceb0b25.
Revert "Disable broken and useless query 'optimization'."

This reverts commit 858784e9871302a61feeaaeda9a8ecca603867d4.
Merge tag 'v1.6'

v1.6
changing copyright in Virtuoso-Adapater
Merge branch 'develop' of github.com:AKSW/Erfurt into develop
adding a ResourcePool to be used for reusing resources that have been fetched before
Merge branch 'develop' into feature/skyrocketingSpeedup
Merge branch 'develop' into feature/skyrocketingSpeedup
cleanup Resource class
Adapting class ResourcePool to the naming convention Resource_Pool
Changing the call in App.php accordingly
cleaning up both files
Adding getPredicates to the Memory Model class
refactor getDescription into store

The getDescription method is now cached with the objectCache
It is moved to the store and called from Rdf_Resource
options are use_ac (maxDepth and fetchInverse will follow)
fix missing AC check for getModel
ASK Queries will be loaded from cache now
use user URI for cacheID creation