Adds domain models for metabolites.

Generated with 'grails -classpath lib/ db-reverse-engineer' after
copying the Oracle JDBC to the lib dir. Then tweaked by hand, took as an
example the proteomics domain models.
Changes argument to match type
Comments out the Reverse DB configuration
Initial test files, adapted from Proteomics
Adds Metabolomics module based of the proteomics.

Also adds the properties biochemicalName and hmdbId.
:fish:
Adds some values for the biochemicalName and hmdbId
Adds test for retrieving data
Adds INNER_JOIN import
Better name for test
Adds test stubs
Makes a proper test
Stub search by HMDB
Working on tests for metabolite retrieval.
Completed tests for fetching all data and search by metabolite.
Merge master into features/234-add-metabolomics
ws
Add support for sub/superpathways
Move metabolomics spiec correlations to the module
Update DeSubjectMetabolomicsData.groovy

Add equals and hashCode implementation for class with composite key