* lib/neo4j/batch_inserter.rb: Fix iteration error with trying to modify in-place hash
* lib/neo4j/batch_inserter.rb: Fix iteration error with trying to modify in-place hash

The error occurs with JRuby trunk/1.6 and is due to new hash behavior.
See for more info:

http://github.com/jruby/jruby/commit/d3855728
http://redmine.ruby-lang.org/issues/show/1535

SilverFox70/neo4j,andreasronge/lucene,ivopatty/neo4j,leviwilson/neo4j,cheerfulstoic/neo4j,jessmartin/neo4j,subvertallchris/neo4j,Xenapto/neo4j,andreasronge/lucene,subvertallchris/neo4j,mneedham/neo4j-1,junegunn/neo4j,SilverFox70/neo4j,jmdeldin/neo4j,mneedham/neo4j-1,leviwilson/neo4j,andreasronge/lucene,garmoshka-mo/neo4j,cheerfulstoic/neo4j,SilverFox70/neo4j,SilverFox70/neo4j,andreasronge/lucene,Xenapto/neo4j,thermistor/neo4j,ivopatty/neo4j,garmoshka-mo/neo4j,jmdeldin/neo4j,mneedham/neo4j-1,neo4jrb/neo4j,thermistor/neo4j,neo4jrb/neo4j,veetow/neo4j,junegunn/neo4j,jessmartin/neo4j,veetow/neo4j