Issue #1404 OCacheEntry was extracted
Issue #1404 New write cache was implemented (without tests).
Issue #1404 new write cache was implemented (without tests).
Issue #1404 2QCache tests were ported to RWCache.
Issue #1404 Stale buffer links were dropped.
Issue #1404 First WOW  cache test was added.
WAL was switched off for ORIDs
Merge remote-tracking branch 'origin/develop' into develop
Storages were migrated to new write cache.
New hotfix branch 1.5.1
Transactions now cache reads too. This prevent to have multiple instances inside the same tx of read records
Updated Hazelcast to the official 3.0
Issue #1404 Tests for new write cache were passed.
Hash index size fix.
Issue #1404 Write cache speed improvements.
Merge branch 'develop' into wow-cache
Issue #1404 Default write cache arguments were changed.
Merge remote-tracking branch 'origin/hotfix-1.5.1' into wow-cache

Conflicts:
	core/src/main/java/com/orientechnologies/orient/core/index/hashindex/local/OLocalHashTable.java
Issue #1404 Fix of write cache test issues.
Issue #1404 Dirty pages logging was added in write cache.