Fix build
Add BigLabelStoreGenerator
License header
Change BigLabelStoreGenerator to take arguments from system environment
Merge pull request #1324 from jakewins/fix-for-chain-loading-test

This fixes a race condition in the Weak and Soft reference caches.
Make index creation idempotent

IndexingService.createIndex now just does nothing if it is asked to create an index
that already exists. Instead of throwing an AssertionError. This makes it idempotent.
OPTIONAL MATCH support in Prettifier
Fixes to BigLabelStoreGenerator
Moved BigLabelStoreGenerator to shell so it has Lucene indexes to work with
Move Cypher 1.9 parser into compiler package
Move Cypher 2.0 parser into compiler package
Move internal Cypher classes into internal package
Invalid package + unused imports
Merge pull request #1306 from cleishm/cypher-compiler

Move Cypher versioned parsers into compiler package
Merge pull request #1325 from chrisvest/schema-index-copying-in-ha

Make index creation idempotent
Add @Ignored ManyMergeStressTest for exposing lucene issue
Make sure label scan store readers are closed when their owning statement is closed
Add test to verify KernelStatement closes label scan readers
Add forgotten license header. Meh.
Makes index creation idempotent in Cypher