fix json renderer for empty object and empty arrays
extract method
Merge pull request #95 from wajam/fx-fix-json-render

Fix json rendering for empty object and list
Fix #96 - NPE during Json rendering of null strings
Merge pull request #97 from wajam/alex-json-null

NPE during Json rendering of null strings
Remove var composite iterator ctor and fix internal list access modifier
Changes following code review
Removed pending tx after timeout.
Merge pull request #100 from wajam/manu-txlog-timeout-once

Removed pending tx after timeout.
Merge pull request #99 from wajam/manu-txlog-read-refactoring

Rewritten tx log read. Can now read from a specified Index or Timestamp.
Merge branch 'master' into manu-log-recovery

Conflicts:
	nrv-core/src/main/scala/com/wajam/nrv/consistency/persistence/FileTransactionLog.scala