BUG: Use ontology terms for EBI investigation_type

Use the terms stored in the database and add a new argument, `new_investigation_type`, which is only relevant if the value passed in `investigation_type` is `Other`.

See issue #405.

NOT READY FOR MERGE - I couldn't run the tests in my system.
But if that test changed I would also have to change this test and that
doesn't make a lot of sense to me. Anyone else care to weight in?

On (Nov-07-14|13:52), Joshua Shorenstein wrote:
> > @@ -45,6 +45,14 @@ def testTerms(self):
> >              'Pooled Clone Sequencing',
> >              'Other'])
> >  
> > +    def test_user_defined_terms(self):
> > +        obs = self.ontology.user_defined_terms
> > +        self.assertEqual(obs, [])
> > +
> > +    def test_add_user_defined_term(self):
> > +        self.ontology.add_user_defined_term('Test Term')
> > +        self.assertTrue('Test Term' in self.ontology.user_defined_terms)
> 
> But if this is on the test database using the test data, there shouldn't be anything there, right? You're explicitly checking that with the 'test_user_defined_terms' test.
> 
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> https://github.com/biocore/qiita/pull/522/files#r20040043