Inital attempt at having rexster produce stats.

Stats are to be consumed by tools like ganglia, graphite, jmx, etc.
Fixed default settings for rexster.xml.

Turned of jmx and got rid of the ganglia setting.
Improve comments.
Minor code cleanup and improved comments.
Code clean up and comment fixes.
Improved comments.
Added http as a default reporter.
Minfor refactoring and code reformatting.
Merge remote-tracking branch 'origin/master' into metrics
Include and exclude regex filters for metrics in rexster.xml
Refactoring of class structure for metric configs.
Merge remote-tracking branch 'origin/master' into metrics
Rexster extensions get access to MetricsRegistry

Add a sample kibble to prove operations.
Added counters and timers to script processing.

Metrics are now wrapped around script engine processing in Gremlin Extension and RexPro.
add doc images.
Merge remote-tracking branch 'origin/master' into metrics
Update changelog.