Fix imports
Use sql command instead of api call in console application for cluster creation
Create cluster with fixed cluster id
Reuse existing cluster files
Merge remote-tracking branch 'remotes/degtyarenko/cluster_improvements' into cluster_import

Conflicts:
	graphdb/src/test/java/com/orientechnologies/orient/graph/gremlin/TestLoadGraph.java
Fix issue #1431 (Tx and NoTx used concurrently)
Fixed bug on GEPHI command after issue #1366
Freeze cluster command has been implemented
- Fix issue #1431 (Tx and NoTx used concurrently)
- Review OStorage.callInLock(): add modificationLock call.
- Review OStorage.callInRecordLock(): possible deadlock due to
modificationLock and lock closed in a wrong order.
Merge pull request #1437 from scenari/master

Fix issue #1431 (Tx and NoTx used concurrently)
Merge branch 'freeze_cluster'
Merge branch 'cluster_import'
Minor: OLocalPaginatedStorage refactoring
Minor: removed java 1.7 dependency
Merge remote-tracking branch 'nuvolabase/master'