Introduces fix for the cache poisoning issue observed when a node has the next relationship-to-load deleted.

Introduces method TransactionState.patchDeletedRelationshipNodes() which has its concrete implementation
 in NodeManager. That fixes the relChainPosition of affected nodes when they are in cache.
Uses that method when there are relationship deletes, namely in Command application and
 WriteTransaction.prepare()
Un-ignores previously introduced test that reproduced this bug.
Fixes cache poisoning on relationship traversal caused by cache invalidation order

Ensures that WriteTransaction invalidates the cache entries of deleted entities on Command execution
 and not on prepare.
Renames variable in NodeManager.invalidateNode
Unignores test that checks for the issue fixed and removes extraneous System.out and fixes the assertion
 condition to be correct.
Use jgit to get git describe for the kernel version.
make cypher queries execute in databrowser even when starting with whitespace
Merge pull request #487 from digitalstain/cache-poisoning

Fix for the cache poisoning issue with relationship chain position
Expose problem introduced in commit 2ad8f36c3950371ae963a40311dd41f52c8b90f5.
Adding missing license header.
Added info on where to ask questions. Fixed bug where version info isn't picked up by javascript.
Merge pull request #502 from nawroth/question-info

Added info on where to ask questions.
Welcome @iKlaus to the contributors!
Introduced message queue in ConnectedStateMachines
Moved dependency version nrs to parent pom
Ensure all thread pools are stopped on Server.stop()
Merge remote-tracking branch 'origin/master'
Debugging of wait/notify in clustering Futures
More Debugging(tm) of wait/notify in clustering Futures
Replace synchronized with AtomicLong
Let test run for longer time
Added missing test scope for gson dependency.
Merge pull request #490 from jexp/cypher_databrowser_whitespace

make cypher queries execute in databrowser even when starting with whitespace
Revert to old version of Pax Exam
Merge remote-tracking branch 'origin/master'