Merge
Merge branch '2.2-future' of github.com:neo4j/neo4j into 2.2-future

Conflicts:
	community/io/src/main/java/org/neo4j/io/pagecache/PagedFile.java
	community/kernel/src/test/java/org/neo4j/kernel/impl/nioneo/store/PageCacheTest.java
Pass the PageCache to the stores. Does not compile, because StoreFactory needs PageCache as well.