Ensure consistency checker only checks indexes that are ONLINE
Fixes #1406
Tagging for version 2.0.0-RC1
Back to development version.
Merge pull request #1511 from peterneubauer/master

Fixes #1406
Merge pull request #1507 from boggle/2.0-ccheck-online-indexes-only

Ensure consistency checker only checks indexes that are ONLINE
Moved PrimitiveIterator to util package, moved Kernel Exceptions to Kernel Exceptions package.
Added StoreReadLayer abstraction.
Uses the SchemaCache in the CacheLayer in more places

so that all calls stemming from finding nodes by label and property key
hits the cache instead of going down to disk. This puts the schema index
performance on par with the legacy index access.