Extract some of the HSQL-related functionality into their own methods so that we can later move them to their own class.
Merge branch 'master' into pull-hsql-out-of-extractor

Conflicts:
	jmx-extractor/src/main/java/org/jmxdatamart/Extractor/Extractor.java
Moved the functionality related to writing statistics to the file (which is a Hypersonic SQL database) from the Extractor class into a separate StatisticsWriter class.
Removed remaining references to Hypersonic SQL from the Extractor.
Merge pull request #20 from DavidWhitlock/pull-hsql-out-of-extractor

Pull database-related code out of the Extractor